The Durex arms were set up for 9mm cotters and were slightly under sized to fit the Raleigh spindle. I drilled them to take 9.5mm cotters and reamed the big hole to fit the spindle. The real aggravating thing was that I found out that the drive side arm was originally a timing crank for a tandem and had left hand French pedal threads after doing the above. Spark plug tap took care of that.