"Swingman" wrote in message

Did my usual painstaking set up, and numerous test cuts, then proceeded to
cut the half blind drawer ends on 30 drawers only to find out that I now
have to tweak the jig's fingers to get some of the drawer side tails to
fit.

Any chance there was a change in humidity over the time when you measured
and when you cut? Maybe it rained while you worked or a blast of warm air
moved into your area. Not often, but I've noticed wood change in humidity,
enough that I could measure over the period of an hour.