Thanks for the reply. I eventually want to get the medium sized tanks, so I was mostly wondering whether using these regulators on the medium tanks was possible or would raise any issues. And I also just wonder what the practical difference is between these gauges and the larger ones that I'm familiar with.

I dug around a little and according to Smith's catalog the kit comes with the following screw on welding tips:

lt103 drill sizes 63
lt104 56
lt106 52

Could anyone answer on whether this will be enough to cover all the frame brazing jobs with oxy acetylene, or should I try to add another tip?