I posted this question on another forum but would like a second or third opinion before I hook this up to my welder. I have been looking for a factory TIG add on module for my Powcon 300 MST but have had no luck finding one. Last week I was at a garage sale and bought a Craftsman add on high frequency box. I have used these in the past on transformer and engine driven welders but not on inverter. I use the Powcon mostly for MIG and stick but It would be nice to use it for TIG. Will using the high frequency box harm the Powcon welder in any way? I have used the Powcon for scratch start and with the factory RT10 that's on my other Powcon MS 200 and it works very well for TIG. Thanks for any help with the compatibility between these.