No idea where I would get a brush
Not sure about the leave spring sparks as the higher up the roller would go the more pressure it will apply but you have given me an idea I have some old dampers which i thing came from the boot of a car which might just do the trick
i like it, im also making one of them scarcrow well its converting one tat is built for the arms of the tractor to one that is suitable to be pulled by the quad. ill have pics up soon till i try an get an idea what im building in my head should be easy enough ?!
I guess it would deppend on the weight of the bar. Even with the method in the pic it can just raise up unless its sprung down.
If raising is that big a problem then use a fixed height one & make the adjustments using an adjustable section in the draw bar.