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Super Modulator
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22,358 Posts
The first thing that comes to mind is indeed side clearance, the motor adds a lot of overhang,and I do realize it's position is driven by the gear train.

You can minimize the oval side plate of course.

My experience has been that it's hard to make the brush much wider than the rails, which means it will not be covering all the rails in a curve. One idea is to articulate/pivot the sweeper into a turn. Then I think you could minimize the width of the brush, and solve the issue.

I use a unit sold commercially, the following picture is not mine, but shows it on a short wheelbase car:
 
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