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It might be possible if I WFH one day and I went over for lunch and they were cool doing it while I waited but I try not to impose myself too much on their work timings. There is a closer shop but I don't like it.
I'm buying a bench vice. It's a start.
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Fortunately I was given such a bench vice by a mate.
Fine as it goes, but, I'm not an engineer, and you have to buy
and remember where you put the 'soft jaws' adaptors.
If I was going to buy a vice I would be close to convincing myself that this;
https://www.dm-tools.co.uk/product.php/section//sn/FAIVMULTI360#.WugyBpch200
would be much more versatile.
Oh. I ride over, take cranks off, do work on cranks, re-install cranks, ride off. But yes not hugely convenient for you. Maybe there's something similar more local.