I bought this system thinking is might be a good hollowing system. I however have found that it really does not work as a hollower due to twisting and vibration of the bar where it goes into the handle. The super ring is very tricky to set up and is not very good cutting hard,dry wood. I found a gap in the end of the 5/8" bar tab, that causes movement of the cutter arm; you cannot get it tight enough to prevent movement when hollowing. It is slightly smaller than the actual cutter arm, so there is this gap. I contacted Crown in England and they told me it was "miss machined" and would send new parts. They never did, nor would they answer a second email.
I find Crown to be a very good tool company, with a long history; But I think they got it wrong with this one.
I find Crown to be a very good tool company, with a long history; But I think they got it wrong with this one.