That's what I was concerned with, the thing slipping. The clamp that came with my Lincoln has way more bite.I have that ground clamp on my Miller Thunderbolt. It can carry a lot of current. It works OK on flats but not great on rounds. It tends to slip off at the slightest bump. I have gotten to the point of clamping a pair of vice grips to the work and attaching the clamp to the vice grips.
Brian, Thanks! I am torn between the Everlast 255 and the HTP 221. The Everlast is less and perhaps has more features.So far so good for me. I have burned about 5# of filler metal so far. The only issue I had was a fitting failure on one of my water lines. Noticed the line leaking one day. Never seen a fitting fail like this before.