Installation

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 pegs@twofold.com.au

IMPORTANT: Before you install

We recommend that installation and removal of the Perfection pegs should be carried out by an experienced luthier.
Please take time to study these instructions and understand them completely before you attempt an installation.

An incorrect installation:

  1. May require rebushing or repair of the peg hole
  2. Can cause the pegs to malfunction
  3. Will void the warranty on the pegs

Peg characteristics

  • There are two types of Perfection peg in each set: pegs for the treble-side of the instrument and pegs for the bass-side.
    The two types are NOT interchangeable.
  • If a peg is installed on the wrong side of an instrument it may not function properly.
  • The pegs have a fine, tapered thread on the shank.
  • Treble-side pegs have a left-hand thread and are marked on the end of the shank with a letter ‘T’.
  • Bass-side pegs have a right-hand thread and are marked with a ‘B’.
  • The pegs are installed on the instrument by screwing them into the peg holes.
  • The direction of rotation when screwing the pegs is the same direction used when loosening the strings.
  • The pegs are supplied in a uniform length and must be measured and trimmed to fit your instrument.

Choosing the right size peg

  • Read the table of Peg Sizes
  • Measure the diameter of all the peg holes on the instrument. For each peg position you should measure the larger hole, the one nearest the peg head.
  • Measuring the diameter of an existing peg at the point where it enters the peg box is an easier measurement to take, and most often this is sufficiently accurate.
  • Select a Perfection peg with a diameter that is just larger than the largest peg hole.

Tools & materials required

  1. Peg reamer – standard profile (violin 1:30, cello 1:25)
  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)
  10. Perfection Pegs

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Steps 1 & 2 – Reaming the peg hole

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1. Preparation & reaming

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.

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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.

* 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 millimeter) to ensure the pegs are suitably aligned.

Steps 3 to 8 – Cutting the peg to length

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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.

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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.

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6. File the peg end

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

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7. Sand the end

Smooth-finish the peg end with very fine sandpaper.

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8. Shine the end

Shine the peg end using the leather patch.

Steps 9 to 12 – Final Installation

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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 curing of the urethane glue).

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10. Glue the thread

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

Urethane is the only type of glue we recommend be used. It has several properties that suit this application. Urethane glue –

  • Provides a strong bond between wood and aluminium,
  • Expands on curing,
  • Will soften with heat to enable the removal of a peg, should this be necessary.

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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 millimeter or so) to ensure the pegs are suitably aligned.

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12. Clean up & let dry

Wipe off any excess glue.
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.

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 the removal.

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