Electrolytic corrosion between different metals, (or even the 'same' metal, but with different hardening qualities or alloy specifications), can be a bigger problem than galling, especially in a wet and chemically laden (chlorine) environment like a pool. I would suggest finding someone who can Tig/Mig or gas-weld aluminium, and bonding all the 30+ rim parts with aluminum wire or strip loops in inconspicuous positions, and using the same technique to provide a thicker Al. lug for grounding. Properly done, Al. welds will very neat, the expertise required is in welding the sheet metal without blowing holes in it! At the lug, protecting the interface (with a copper wire?) from corrosion can be effected with grease/sealant/paint to keep it dry.
Alan
[This message has been edited by Alan Belson (edited 07-19-2005).]
