In article .com, "Andy" wrote:
I haven't tried this, so someone else please correct me if it won't
work, but why not color the sides and end of your tenon with chalk or a
soft-lead pencil, try it in the mortise, and see where the chalk rubbed
off most inside the mortise? Seems to me like it should work.

IMO it almost certainly would work to identify the problem area. I've never
tried it, though, because I worry that the chalk or graphite may interfere
with the glue bond. Maybe I'll try an experiment some day...

In the
past I've always been able to figure out which sides need more chopping
or paring by just wiggling the tenon piece and noting where it feels
like it is stuck. Does that make sense?

That's what works for me most of the time...

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.