hi,
try takin the spanner once it is mounted and put a pole around it and pull , it may work
if it doesnt dont pull really hard because it may pull threads out of the crank arm...
Hi, I am Dale. I come from Southampton and I ride an Onza T-comp. I've been riding for about a year now and ride about 3-4 times a week. I also ride motorbike trials on a GasGas Rookie 80. Dale