How interchangeable are different torches? I've got a SIP which works well in that hot stuff comes out of the end melting anything metallic in its wake. But I'm not happy with the quality of the cut. While doing a night school welding course I used a plasma cutter (can't remember what make) which left a really clean cut. I put this down to the torch. I notice that there does not seem to be a standard connection for torches (a la eurotorch) so was wondering if I would have any difficulties if I was to purchase a higher quality torch to fit to my machine?