Re: Shaft size adjustment
There are also things called "Speedi-sleeves" available: they're designed for use where an oil-seal on a rotating shaft has grooved the shaft to the point where the oilseal no longer seals properly.
Basically they're a very thin-wall stainless steel tube with a 'top-hat' section on the end, which is used to force the sleeve on to the shaft then is cut away.
Not sure if they are available in 1/4-inch/6mm size but I've used a half-inch one to repair the propeller-shaft on an old putboard motor with impressive success.
RS sell them, though they're actually made by the Swedish company SKF.
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