12-step installation guide

You can download a printable version of the Peg Installation Instructions here.

If you have any questions please contact us at

Before you install

We recommend that the installation and removal of Perfection pegs should be carried out by an experienced luthier.

An incorrect installation may –

  • require rebushing or repair of the peg hole
  • cause the pegs to malfunction
  • void the warranty on the pegs

Peg characteristics

  • Perfection pegs have a fine tapered thread at the end of the shank that secures the peg in the peg hole.
  • For all Perfection peg models, there are two types of peg, those for the Bass-side, and those for the Treble-side.
  • Bass-side pegs have a right-hand thread on the shank and are screwed in clockwise. The untrimmed peg has a “B” marked at the end of the shaft.
  • Treble-side pegs have a left-hand thread and are screwed in anticlockwise. They are marked with a “T”.
  • For all instruments, the direction used to screw the peg into the peg box should be the same direction that will be used to tune a string flat.

Choosing the right size peg

  • Read the table of Peg Sizes
  • Measure the diameter of all the pegs on the instrument.
  • For each peg measure at the point where the peg enters the peg box.
  • If the pegs have different diameters we will use the measurement for the largest peg.
  • Select a Perfection peg with a diameter that is just larger than the largest peg.
  • Perfection violin pegs come in sizes with diameters of 7.8, 8.5 or 9.0mm
  • Cello pegs have diameters of 12.0, 13.0, 14.0 or 15.0mm

Tools & materials required

  1. Peg reamer – standard profile (violin 1:30, cello 1:25, guitar/ukulele 1:30)
  2. Wax pencil or marking pen
  3. Saw – fine tooth
  4. File – fine-tooth, or belt sander
  5. Sandpaper – fine (P220 grade/600 grit)
  6. Leather patch
  7. Cotton buds
  8. Water
  9. Polyurethane glue (eg. Selleys Durabond, Gorilla Glue)
  10. Perfection Pegs

Steps 1 & 2 – Reaming the peg hole


1. Preparation & reaming

Violin, Viola, Cello – instruments with a two-sided peg box

Prepare the instrument by removing the old strings and pegs. Select which Perfection peg will be used in which peg hole and identify the head of each peg with a wax pencil mark.

Use a standard peg reamer to lightly ream the peg holes. Take care, remember that the final turn of the reamer can make the difference between a fit that is too tight, or too loose.

Guitars & Ukulele – instruments with a single-piece headstock

Installation of the peg model P1UK for guitar and ukulele generally follows these same instructions, excepting that the P1UK does not require trimming and is designed to fit a single-piece headstock.


2. Test the fit as you go

Test the fit of the peg in the hole as the reaming proceeds. Ream sufficient to allow the pegs to self-thread firmly.

When a peg is fitted to the instrument the thread of the peg is screwed and glued into the peg box, and the far end of the peg floats in its hole. While preparing and fitting the peg you will notice a small clearance at the far end, between the hole and the peg, this is intentional and allows the inner shaft of the peg to turn freely.

Peg box width is a variable, different for every instrument; the depth of insertion of the threaded portion of the peg can be varied (by about a millimetre) to ensure the pegs are suitably aligned.

Steps 3 to 8 – Cutting the peg to length


3. Initial fit

Select the correct peg for the peg hole on which you are working.
Screw the peg into the peg hole until no thread is visible.

4. Mark the peg length

Mark the peg where it protrudes from the peg box.
Remove the peg from the peg box.
Keep track of which peg is being prepared for which peg hole.


5. Cut the peg to length + 2mm

Trim the peg to length with a saw. Cut the peg end proud of the mark by 2mm to allow for shaping the peg end.


6. File the peg end

Round off and shape the peg end with a file or belt sander.


7. Sand the end

Smooth-finish the peg end with very fine sandpaper.


8. Shine the end

Shine the peg end using the leather patch.

Steps 9 to 12 – Final Installation


9. Moisten the peg hole

Dip a cotton bud (Q-tip) in water. Lightly moisten the exposed wood of the peg hole on the head side (the moisture assists in curing the urethane glue).


10. Glue the thread

Apply a small amount of polyurethane glue (such as Selleys Urethane Bond or Gorilla Glue) to the thread. Use only enough glue to fill the thread.

Urethane is the ONLY type of glue we recommend. The use of other types of glue will void the warranty –

  • Urethane glue has several properties that suit this application –
    • It provides a strong bond between wood and aluminium
    • Cleans up easily before it has cured
    • Expands on curing
    • Will soften with heat to enable the removal of a peg

11. Screw in the peg

Screw the peg in until the threads are flush with the peg box*.

  • The direction of rotation when installing the pegs is the same direction used when loosening the strings.

The fit should be close enough for the final turns to be firm, but not too tight.

  • The urethane glue will expand on curing and fill any small gaps.
  • You can wind a rubber band around the shank to act as a grip so that sufficient torque can be applied to the pegs when screwing them into the peg box.

* Peg box width is a variable, different for every instrument; the depth of insertion of the threaded portion of the peg can be varied (by a millimetre or so) to ensure the pegs are suitably aligned.


12. Clean up & let dry

  • Wipe off any excess while the glue is wet.
  • Allow the glue to cure.
  • Bed in the action of each peg by exerting a gentle inwards pressure and turning it back and forth a few times.
  • Install the strings.

No maintenance required – ever

Perfection pegs require no maintenance throughout the life of the peg. The internal gear mechanism is packed with a high viscosity grease at manufacture and then permanently sealed.

DO NOT LUBRICATE your Perfection pegs as this will damage the mechanism. Lubricating a peg will void the Warranty.

Peg removal

Perfection pegs can be removed from an instrument –

  • Apply a small amount of heat to the aluminium shank of the peg, just below the head.
  • Use a soldering iron or a flame (applied for about 5 seconds).
  • The heat will conduct to the glued joint and soften the urethane glue.
  • The peg can then be unscrewed.
  • A pair of soft-jawed pliers can be used to assist in the removal.