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I managed a stall showing off the Raspberry Pi, Arduino and Shrimping kits to the teachers, students and general public.
Putting the weight of the four AAs over the wheels should help with traction. The beautifully drilled whole is where the line sensor will drop through the floor.
Once the threads were removed and their landing points filed off the cradle looked quite good.
My version of the cradle can be found on Thingiverse: www.thingiverse.com/thing:2062472