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nope nothing special... i did realize that the rear wheels are slightly larger. coming from a muscle machine cartoon edititon... anyway. both the front and rear MM wheels are glued to the regular bit wheels. no holes needed to be drilled..
you could use an xacto knife to shave the mm wheel so that the bit wheel fits inside it a bit better, or you could shave the bit wheel so that it fits inside the mm wheel...
you dont have to do either, but by doing so its easier to get a good flat fit on the two wheels so they dont wobble when they spin..
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