speed reduction with variable input power?

[jsburger]

Maybe find and retrofit one of the old style speed changers?
(Photo courtesy of Everett Davis)

That will not work. The way tubes are not the same distance apart on the Model 10 and the MK5.

[kenbu]

Here's an older thread on other ways to get variable speed, including my setup using a 12v trolling motor driving the aux shaft to get reversing, too.
viewtopic.php?t=17525

Ken