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Film canister city here...
They go from ~ 31.9Ø OD to 31.6Ø OD to allow for the draft to get them off the injection moulding tool. You could fill them with P38, Araldite, Milliput..... the list is endless.
I don't think the drop in Ø will be significant for your purposes.
Second thoughts - tightly packed sand is probably a better (and reversible) bet.Edit - You'll most likely struggle with the 'paint' bit. They're most likely fashioned from polypropylene or something similar. Which not much will adhere to.
Insulting tape wrap?
Yes, I'm wondering about one of those film canisters. The ones with very solid lids. Mount the bolt in the cap. Fill the canister with sand for ballast. Paint.
Mmmmm, bodgy.
@constable_savage, if I could relieve you of that bolt (fnar), I'd appreciate it. Where is good for a handover? I'm south east or central.
Thanks all.