[pianotech] Knurling - was Glue strength for pedal lyre

[Ron Nossaman]

reggaepass at aol.com wrote:

> And mighten it also add some gluing area (at least, theoretically), 
> which is a good thing?

if the dowel is knurled with a machine, it will be both 
smaller in diameter, and rounder. If freehand, it will be 
pretty much the same diameter, and likely less round. Some 
surface fibers will be chewed in the process, which will make 
for more gluing surface, but the difference in the bond 
strength for a dowel through a glue joint will be negligible. 
Titebond as a gap filler in this instance is more than 
adequate for the job.
Ron N