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Good Question ...most pegs today are indeed 1:30 taper as are readily available peg reamers and the peg shavers are pre set at 1:30 but are adjustable as well ...
Standardized industry modern violin specs were officially put into effect in 1952 but were being used by many builders much earlier ...
You may find different tapers in older violins , say , before 1930 or so ..
In these early violins there is generally enough material in the peg box to re ream the holes to 1:30 but if it is a historic / expensive violin i would keep it as original as possible .
I do recommend a spiral reamer over a straight reamer as the latter can chatter ..I also made a peg holder out of wood to hold the peg for drilling the hole for the string by drilling a block , them reaming and cutting off the top to open it up ...works great ...
Hey Ferret ,
If this is yer first time fitting new pegs I would be remiss if I didn't point out a detail of the learning curve you'll encounter ...
when setting peg depth at 14 mm on my first set of pegs , I found that once string tension was applied , the pegs drew in deeper by about 1 1/2 mm to 2 mm , leaving the string holes off center and excess peg tip exposed ...so the next two violins I fitted pegs to , I set the depth at 16 mm .. and drilled the string holes 2 mm from center toward the thumb rest ..and did not trim the tips until fully strung and drawn to their final position ..this info may save ya a re fit ..