Breaking in serrated brushes, soldering

[joeRS4MT]

How far should the serrations be worn before they are broken in? Also, they are the solder on type, does it work best to solder them directly to the tab, or to the area where the eyelets screw into.
Thanks,
joe

[BBalak]

I would solder them to the tab. Here, check this out:
http://www.rccaraction.com/articles/dialin_stock.asp

Bryan