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Chainring removal from 1 Piece Crank?? (with solution)

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punkdSICO:
UPDATE: this bad-boy did it wtihout any effort (hold the arm in a vice):

http://www.wiggle.co.uk/bbb-btl-24-multihook-bottom-bracket-tool
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Hi all - last minute panic building ready for this Saturday's ride!!



How the flip to I get the housing nut off the crank arm?  Im trying to swap the chainwheel but I cant get the nut off (the thing with 3 notches in it).  I'll take it along to Halfords tomorrow night as I hoping there is special tool with 3 notches in it??

I tried to hold it in a vice but no joy..

Special tool??

ta,

Paul

john4130:
it needs 2 special tools to remove it. hammer and chisel.

theRuler:
Or a hammer / screwdriver - or a flat bar, old seatpost, anything.  Couple of thwacks and it'll it fly off (your finger, I mean)

punkdSICO:
Cool - ill give that a go before popping to Halfords.

btw, it does screw the normal way on the chainring side??  eg, anti-clockwise to remove??  (obviously reversing that if attacking from the back as show in the photo).

ta,

Paul

Jon The Bassist:
Yep, there's a spanner that fits. Are there no OSers near you that might have one ???
I think looking at the back of the sprocket, it comes off anti-clockwise.

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