Hello 

There are 4 brushes on the motor. They are held in place by rubber covers that you unscrew. 

I find it easier to bring the motor out of the engine room to work on the brushes. 

I cleaned the carbon dust twice in the space of a couple of weeks and eventually replaced the brushes. Looking at the new ones, I noticed the old ones were slightly cracked lengthways, which could have explained why they wouldn’t slide so freely in their housing and would eventually lose conductivity. I guess i could have sanded them down a little to fix the issue. 

We sourced the brushes here:

vendite@...

Product code SP1812MC50

They’re not cheap (about €15 each) and they had a minimum order of €180 and would only
ship dhl which was €60. The company was a bit of a pain to work with, as they usually only work with companies, not individuals. 

We got a discount for ordering 3 sets of 4 brushes n springs, and still have a spare one.

Hope that helps

Thomas

GARULFO

A54-122

Nuku Hiva, Marquesas, French Polynesia