[pianotech] More agraffes...kind'a

[Ron Nossaman]

On 8/20/2012 3:03 PM, Jim Ialeggio wrote:
> I've tried placing finish washers in the counterbore, held in by the
> weight of a screw, but I'm not happy with this, as it bonds the finish
> washer to the counterbore sides, creating chipping problems of its own,
> though less than no finish washer.

In all cases, whatever you use for a mask, take it out and clean up 
before the finish cures hard, like within a couple of hours of the topcoat.


> Ideally, I'd cut a small bevel on the counterbore sides, and then not
> worry about masking the countebores, but in playing with this, I don't
> have a countersink remotely shallow enough to do the trick in such a
> shallow counterbore.

The primer is the big buildup problem. spinning a strip of sandpaper 
over the counter bore, pressed into the center with your finger to round 
the corner down helps. So does spinning your spot facer in the counter 
bore to clean it out, also before the finish cures hard.

Ron N