That's great that it's working for you! In my experience, I found soldering wires to have a poor mechanical toughness--mainly because it's so brittle.
If it ever breaks on you, I'd suggest you look into something called Safety Wire.
It's used on motorcycles when you race on tracks. What you have to do is drill holes in certain bolts and then use safety wire to attach it to a hardpoint (so the bolt can't come loose). This is so motorcycles don't leak fluids (which can cause accidents and fatalities on a race course).
To use safety wire on a plunger head, you'd probably drill two holes, string the wire through, then use a special twisting tool to twist the wire tight. It is mechanically tough because it is a ductile material (it's not going to shatter like solder might do). Afterwards, I guess you could slap JB-Weld on there for support.
But it seems like your fix is working just fine the way it is. Good job! I've always hated plunger repair... usually pretty hard to work with (in terms of keeping the catch points clean and holding all that force with minimal surface area). Just one of those things that simple old glue can't fix...
EDIT: I hate my habit of interchanging "strength" for "toughness"...
Edited by frost vectron, 06 May 2007 - 06:50 PM.