Yup, that's my idea. I've never seen it anywhere, least not that i can remember. If you look up the capstan formula, it shows how the coefficient of friction helps determine the amount of force needed to hold a load, or in my case raise one. Sailboat instruction books show how to ease a sheet off of a winch, and you place your palm of your own hand, fingers clear obviously, to help guide the wraps as you ease the line down. The tire should act similarly, by pressing the line into the drum you are greatly increasing friction, which should mean when i winch the lines are held tight, in position, and will self tail because from the ropes point of view it's like i have tons of wraps on the capstan. By being a rolling element, the wheel should allow the drill to winch because it doesn't impede that at all, it just adds friction like a sheave would. Don't know if it works yet, i just got it built to be able to try it.