Re: semi finish bearings / resizeable bearings / full floater
The Tobin machine is essentially a 'line bore machine' for bearing shells and/or caps. If you can find somebody who has one and knows how to use it, then this would be a good approach. I believe you could make a one-off custom holder that would work in a lathe - specifically for the full-floater 91A/21A bearings you have. If you want me to draw you up a 'fixture' - and then you could have it made, ping me off line. There are guys with the Tobin machines - you should be able to just send them your bearings and the crankshaft dimensions . . . if you can find "that guy". Good luck
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