Galbreath head, Nelson plugs. Cheaper on plugs, and enhanced performance as a bonus. Fits Coxes, Norvels, I think VAs, at lease the new ones, I guess Cubs since Cox heads will interchange with them. The heads are $10 (but a 1-time purchase of course), plugs are something like $3.50 or $3.75. They last forever. Everything runs better with it!
--Ray