I started restoring my Griswold hotplate and was wondering if anybody has ever done one. I want to convert it to propane and pulled the orafices off last night and I think they are propane orafices. I think this hotplate has been restored before but just don't know.The gas company's up here are no help. I looked at gas orafices and propane orafices and the gas ones have a much bigger hole. The ones on mine are very small, almost like a pin hole. Any help would make me a happy camper and I don't want to blow myself up. Thanks