<html> I use powdered rosin for tuning pins. Jon Page At 07:31 PM 04/03/2001 -0700, you wrote: <blockquote type=cite cite>Roger Jolly Writes > Now all this talk about pin stability has me thinking,  the next old junker > that I get that needs a bridge cap, I'm going to use some varnish as a > driving fluid for the pins. It works well with tuning pins, why not bridge > pins????????  The pin should drive easier, less stress around the hole????? >  Will it help to seal the end grain of the hole and improve stability????? > Am I nut's? probably. > > More questions than answers I'm afraid. > Have a good one. > Roger >    Hi Roger'     All good questions. Now I have some.  I've wondered about driving fluids as well but have not used them.  I'm using buldoc/stwy blocks in all stwys/Rebuilds and the pins are hard to drive and no matte how consistently I drill I.E. same speed,pressure and air cooling there will always be some tortional inconsistencies.  That being said I mostly like how they tune.    My question is this. For those of you who are using maple blocks and driving fluids ,do you think it affects tuning smoothness, changes tortional values or is it just a way to make driving a pin easier.  My srtinger(Terry) is a little five ft. Italian gal and although plenty fiesty would appreciate any help in the  driving each new One ought pins into freshly bored maple.   Also if driving fluid changed slightly the pin torque and allowed for smoother rendering that would be fine. The finest tuning piano in the world is an old steinway thats never yet been restrung. You know the kind ,well preserved and unadulterated.  The pin torque is so even and the tuning ends up being so stable because the pin doesn't wrestle with the tuner!!!!        What solution is used and the how application is made and when is also a huge part of the info. I,m seeking.  There that about covers it for now                Best                Dale Erwin ></blockquote></html>