Okay I had nickle plated one on my X1 CRT and knew it wont last..Then I made one from using nitro clutch bell and that also did not last very long..Whats a hard pinion but also something that will not chew up the spur?
Only other options maybe Robinson Racing pinions or Novak pinions on Towerhobbies.com But shipping cost may be the same there...
I highly suggest you stick to RC-M pinions are they are constructed of the highest grade metals and hardened more than any other in the industry. Good luck wearing them out.