KLH Model 21 found at Goodwill today!

[zeno]

Try a drop of WD40 & let it sit a few days. Also heating them
may work. If the heads are stripped you can grab them with
a pair of dikes. Once started they come right out.

For small stuff get a set of ISO phillips heads. The jap stuff
needs a perfect fit or you cant get them out. They let out
a snap then turn OK.

KLH will use the US standard like a #2 phillips.
Buy highest quality so they fit perfect & dont strip like the screws.

73 Zeno

[Electronic M]

Originally Posted by zeno

Try a drop of WD40 & let it sit a few days. Also heating them
may work. If the heads are stripped you can grab them with
a pair of dikes.

PB Blaster penetrating oil is better than WD-40 at loosening fasteners. If you can grab the head with a vice-grip wrench those are often a bit better at gripping than dikes.