seized mixture screw

[Marx3]

Hi, I am about to rebuild a marine 17080561, the owner has bought a Holley marine instead, but the other engine ( two 350's ) still has a Qjet. So I thought he would be better off with having the original Qjet in place back with the other.
But a mixture screw is seized in the basplate, are there any tricks to get it out, other than heat/ cooling etc.? I mean, should I just forget about getting it out??? I haven't seen the carb yet ( will get a closer look at it tommorow ), so I don't know hov far in the rest of the screws is sitting.  ( sorry if the trick is in the book, I have read most of it, but can't recall a particular chapter that adresses this sort of problem. )

[Cliff Ruggles]

We use a product here called Kroil, it will loosen up just about anything that is rusted in place.

A few seconds with a propane torch on the baseplate will speed up the process, it's pretty rare when I can't get one to loosen up.....Cliff

[Cliff Ruggles]

PS:  we sell complete HP kits for Marine carburetors, with upgraded components, ethanol compatable, and dozens on parts not found in over the counter kits.....

[Marx3]

Okay, I suppose it is some kind of liquid?

I sure hope I can get it out, a holley is installed as a substitute. ( Qjet on the one engine, a holley on the other ) Both Qjets needs rebuilding later on!

Thanks!