Walk in to Evans. Buy any SRAM GXP crank. Accidentally remove the crank bolt. Return crank to Evans for refund*
- I'm not actually recommending you do this. Not at all. No. And I'm only assuming that GXP cranks have the same bolt, I've no evidence / experience to suggest they do.
Actually, you could probably borrow a bolt from someone on here - there's got to be someone who has a gxp crank kicking around who could lend.