TargetTalk

You should put a small amount of grease on the threads of the regulator. It will transfer to the female threads on the cylinder. When screwing in the cylinder, if you meet any resistance, unscrew it and start again. Do not force it or you will damage the threads on the cylinder. Put a little grease ...

Having the same problem with mine....I'm leaning towards a synthetic lube on the threads solution....silicone grease did not work for me either.