I made the presto pot about three years ago when I first started making candles because I was tired of the double boiler. All I did is drill the hole and slowly thread the valve on a little then backed it out and turned a little more make sure to use some kind of lube to make it easier. After you get it in put a nut on the inside for extra strength and use Teflon tape to seal it up good. Mine has never leaked yet. Have a happy Thanksgiving.