I've been using MC-59 glow plugs in the Mach .26 and was curious if a (better?) different plug would help with starting?
For the Mach, if you are using 25% nitro or lower, you want a hot plug. Dynamite actually recommends the MC-59 for the Mach. I was runnnig Higher Nitro, and using a cold plug. McCoy's are pretty good plugs. I'm not sure of what plug compares from other manufacturers.
If your using 20%, stick with the MC59. It's a good plug for that motor.
What about an OS A3 plug?