[Nonfractal]

Update on pinions.
Pinion removal: 
Used a dremel disc cutter to remove the pinion's  spigot.
 2mm drill to open the hole for access to the motor spindle.
Used a regular ninco puller to remove the pinion. 

Pinion change needed because I wanted to shorten the 10/27 gearing but a 28 crown grinds on the bodywork preventing full suspension movement.

At 10/27 the car felt really sluggish and heavy. 
9/27 is the next ratio to try.

Sloting+ collars hold the assembly in line (whether the spigot is in place or not)