I have a pair of two rtv'd hockey pucks stacked to be used as bumpstops inside your coils. Two stacked pucks, on pair so a total of 4 pucks, already rtvd just need to be rtv/epoxied into the coil. I was planning on using them but ended up changing my mind and going a different route. Just looking to giving them away, looking at just selling them for the shipping costs.