My best bodge was on a bike – but one with an engine.
Crashed my BMW 1100GS in the Himalayas and punched a hole in the aluminium cylinder heads. BMW spares were not an option.
Perceived wisdom was to mix some araldite with cotton wool, pack the hole and let it set. Luckily the german guy I was with had some 2 part glue but we couldn't locate any cotton wool.
My GF had gone home (due to a paragliding accident) but rooting around in my stuff I found a tampon. Opened it up, mixed the glue in and slapped it on.
Hey Presto! Still holding 3 yrs later. Got another head cover but never fitted it.