My Lee 4 20 gave a few drips in its early days, I removed the valve arm assembly and put the valve rod in my drill and lapped it into the valve with valve grinding past. I have had no leaks in the last 5 years and I have put some 400KG of lead through it. I only put clean lead in the pot and do not flux lead while in the pot, I also do not keep casting past about 1inch of lead in bottom of the pot. I have done two of these 4 20 pots and both work just fine, yes they are cheap but with a little care they work just fine. Regards Stephen