I want to convert a legally obtained sanke keg into a HLT and need advice on how to drill the holes for weldless fittings: valve, thermometer and sight guage. What is best to drill the holes, a step bit or a regular drill bit, using a small bit to start, then the correct size to finish? Where's the best place to get a step bit for stainless, cheap? What are your experiences with weldless fittings? Are they dependable?