Just got a couple of quick questions:

Does this switch count as a removable link or does it need to be a whole section of circuitry?
http://www.fingertechrobotics.com/proddetail.php?prod=ft-mini-switch

Does a smaller disc work as well as a bigger one if the rpm is higher? When does the disc become pointlessly small/should be replace with a drum for a better attack?

Quick CAD update:
I found that the original disc was ~250mm, so the disc will have to be smaller (hence above question). I would like to keep the robot within ~45 degrees because I think that otherwise it will start to look too tall.