[topgun]

I have been reading the various 6WD threads and I have some questions.

Regarding lowering the center wheel when driven directly from the motor/gearbox. How can you make it adjustable up and down or do you make the outer wheels up and down adjustable? Which method is easier to maintain and more effective over time?

Many people talk about 1/2" hex axles. Wouldn't 3/8" hex be just as effective and strong mechanically, easier to machine (if you have a smaller lathe) and cheaper to purchase a broach for (2/3rds the price)?