A few years ago, I got a Weller WHS40 soldering unit, which was
excellent until the tip "decayed". I got some replacements & then
discovered the set screw that holds the tip in place was totally
frozen. Unfortunately it has a tiny slot in it, & I ended up chewing
up the ends of all the screwdrivers that would fit, without success.
I then discovered that the manual recommends loosening the screw
frequently to keep it from getting stuck. I also found out from
searching the WWW that this is a common problem, & some people
recommend replacing the original screw with a hex head screw of the
I gave up & ordered a new soldering iron (just the iron itself, to
plug into the base), which should arrive any day now. I don't want to
ruin another one, so...
Should I grease the screw threads with something to prevent sticking
(& if so, what) or will anything on the threads end up getting cooked
& making it jam up? (Stuff I have in stock in the house includes
silicone grease, very old lithium grease, & some copper-based stuff
for keeping threads on bike components from freezing, as well as the
Should I just loosen the screw after every use & store it that way?
Is there any reason not to replace the set screw that goes all the way
into the tip-holder with a screw with the same thread but a head (with
a hex hole) that will sit outside the tip-holder of the iron?