I have a broken knob on one of the stove burners on my westy.
Actually, it's not the knob, but the actual stem that the knob slides
onto is broken about 1/2 way down its length.   I might be able to
fix it with a screw and some jb weld, but I'm wondering, is this part
replaceable?  Or do I need to replace the entire gas valve for that
burner?   Can you get those part(s)?