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I use a reamer to enlarge the hole until it's large enough at the surface, then a drill of the right diameter to open out what is then a conical hole to parallel. This also avoids chipping on the back.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I think a tapered reamer followed by a drill as per @ICBM is probably a safer option, possibly with the neck suitably clamped in a vice to provide extra support to avoid it splitting. The last thing I want to do is split it, given how nice it looks!
I'll wait until I get the tuners, so I can some proper measurements, as the Schaller technical drawing doesn't include any details for the securing fastener.
To be honest I haven't needed to do this job for quite a long time though - the fashion for chunky sealed machineheads seems to have passed, more or less - so I'm not sure if it would save me a lot of work now...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein