Now, a couple of thoughts...
- How about using gravity to help make better contact? Like build a small decline into the charging contacts. The magnets are a decent idea too, but they could interfere with charging for one and you'd have to play with different strengths (too strong and the car can't pull out)
- Another idea is using a 'V' for the pit lanes going to the charger...Like a funnel, that way you don't have to be exact when backing up (we all know how easy it is to be EXACT with a Bit right?
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