[CAUT] glue sizing bushings

[Fred Sturm]

On 10/19/06 2:45 PM, "Jim Busby" <jim_busby at byu.edu> wrote:

> Hey Fred,
> 
> At the same time steam the BR hole add the right pin and the hole is
> also sized. If they're buggered up glue size them. Que no? I always do
> this and rarely have to touch the BR hole with a tool because it dries
> perfect (well, most the time <G>). It usually solves the pulley key
> syndrome too. Jmtb.
> 
> Regards,
> Jim Busby BYU

Yes, and about the balance hole in general, while the keys are in the
clamps, you can take a pin in your fingers and insert it in each hole
rapidly and feel which might be too loose or too tight. And glue/steam size
or ease with a tool before you put them on the pins. If a lot are too tight,
which happens a fair amount with both new and old instruments here in dry
country, I often like to use the appropriate sharp drill bit, held in the
hand and twirled with the fingers, to go through a set of too tight pins in
preference to using an easing tool. Running a pin chucked into a drill
doesn't quite do it - you need a couple thousandths over size, in the #0 -
60 set of bits. A very light touch leaves a perfect set of keys. You can
also get precision reamers for the purpose, but I find a drill bit works as
well as long as it is fairly new and the flutes are sharp. (And sometimes
you find the thickness of the hole portion of the bottom of the key, as
opposed to the portion that is completely relieved, is too tick, in which
case you need to use the tool for reducing that thickness.)

Regards,
Fred Sturm
University of New Mexico