Thanks for the reply Mike. Using the Losi Conversion kit I gather using 4mm screws is the hot setup. Other guys have posted that they remove the front from a Neu or Castle Nue and retap two of the mount holes as 4mm for better fitment on the Losi mount. I've got Tekno Neu motors and they don't have a front part like the Castle's and Neu's do so I'm a bit weary to tap the holes and possible damage what's behind them.

A custom front cover is a possible solution, the only concern I'd have is that I've heard the Losi Mount is very deep and you just barely have enough shaft to make it work as is. With an adapter, I wonder if that pushes the motor too far back to make good contact with the spur.

I don't have the Losi yet so I'll take a good look when I see it.