i'd be scared to reverse the polarity w/ the adapta plugs.
Tip : assemble adapta-plugs...and tap the seem with your soldering iron...that will sort of seal them - no reason to disassemble those parts anyway...
I opted for adaptaplug when I did the wiring so that I could just swap on the tips for my ps-2 or ua-5. It saved me from having to snip, strip, splice and crimp cables for everything. When I need to run 2 or more things on the same sla, I just stick in a y cable.
If you know you only want it one way, then your tip, or crazy glue is a great way to go.
I'm just a little out of control, and have made cables for adapta-plug to everything but 4pin xlr. I could run every piece of gear in the section if I were to cart around a 6v SLA too.
JAson