Mechanical brake / Castle Neu problem

Hi all,

Having given the truggy a bash with the motor brakes on a few different settings, as well as a few different pinions, I have decided to go back to mechanical brakes.

I've now run into a problem. With the old feigao motor, the smallest pinion I could use was the 14T. I had to grind down the brake pad holders on the rear brakes a little in order to get it to fit, but it worked fine, although I normally ran with the 15T pinion.

I tested the 15T pinion with the motor brakes and the performance and amp draw was perfect, so I want to use mech brakes with that. Unfortunately the CC Neu motor is a slightly larger diameter than the Feigao.

The largest pinion I have is a 17T and it barely touches the spur lol. I could grind down the fins and get it closer, but from the looks of things, it wouldn't be close enough.

Anyone got any tricks to get it to fit, or do I need to resign myself to motor brakes?

Also, I've got a Medusa 80mm coming, which should be the same 36mm diameter as the Feigao which should fit perfectly with the larger pinions, but that's if it ever gets here. Can anyone with a 80mm medusa confirm that they are actually no larger than 36mm diameter?

thanks