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Concave washers here http://www.sjscycles.co.uk/dia-compe-dc56-1-2-moon-washer-front-each-prod31392/
M6 nyloc nuts almost anywhere, ebay LBS, screwfix etc etc.
Something like this
http://www.ebay.co.uk/itm/like/280827965621?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=108&chn=ps&device=c&rlsatarget=&adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0-L&ff12=67&ff13=80&ff14=108&ff19=0If you need a through bolt buy some studding and cut to the size required, not a particularly elegant solution but probably easier than finding the correct bolt with the correct plain and threaded sections.
2 qusetions
(http://i.stack.imgur.com/bpCjp.jpg)
where can I get nuts and bolt for the traditional brake firtment?
and
My square taper shimano 600 crankset does not slide far enough on the BB and there is a big gap between frame and cranks?
many thanks
Theo