SU loose throttle shafts

Anybody devised any good home remedies for loose throttle shafts on SU's? I
have a few I'd like to see more snug.

Also, I have a set that are very clean, but the aluminum is dark from
cleaning is TSP. Any suggestions for something to dip them in to brighten
the aluminum? I'd like to avoid the really toxic carburettor cleaner dip.

Gerard

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