I follow someone on twitter who explained how to do this at one point, using a Caltrain Clipper card, and put it in a resin ring :) I could dig that up if it’s

I follow someone on twitter who explained how to do this at one point, using a Caltrain Clipper card, and put it in a resin ring :) I could dig that up if it’s helpful but in general I think it’s pretty straight forward, just some risk of destruction :)