The heating element body & nozzle are a single casting in the mini (4") gun,
can't speak about the mid size, haven't seen one out off the package. The
heating element castings in both the mini & full size gun are made of pot metal,
not solderable by most solders. The solder needs to have a melting point above
Probably the best tip retainer solution will be mechanical. I'll be drilling
some holes in the mini I've got to determine wall thickness etc.
Let's take a poll, what size guns does everybody have? I'll keep score. Then
I'll concentrate on coming up with a fix based on popularity.
Jim indicated he found a source of plastic pastry tips, My experience with the
household gadget type plastic is that generally it won't stand up to more than
400F. It's generally not dimesionally stable above 300F.