Hello, I have just replaced the pump clamp washer with one from an eBay seller Juliands kit. It seemed to be a poor fit and is leaking paraffin at this point. Are there different sizes available, have I bought the wrong one? Also the pump leather from the same kit appears to be useless, even after soaking in oil. It was very hard, the oil softened it but it is less effective than the old one at building pressure!