Matt you can make a disk that uses a Prox or a bit of reflective tape. The Reflective tape is a good way to go because you have such a small amount of work to do getting it hooked up! The one that I saw used was a Prox and a metal disk. This is a but better because you can put stuff all over the plate or the prox and it will keep working.
Hope that is a little help... If you can tell me more I will see what I can do about getting you more info.
Thank you
Brian
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