The roto zip is the cats meow. Something I did with mine, was take a 5 gallon bucket, filled bottom with rock/block material for weight. I then took a 3/4" by about 18" square piece of plywood and cut a small hole in it's center. I rigged the roto zips height spacer piece on the UNDERSIDE of the plywood, with the cord comeing out a hole for on/off abilities. I also put some small blocks of wood on underside of plywood to help hold it laterally in place on the bucket.
Why did I do all this? So that when we did our tile installations, I'd have a working flat table with the roto zip bit sticking up so I could do some freehand work where I needed to fine tune some curves or some such.
Just be careful when someone is looking for a cheap seat to sit on /forums/images/graemlins/crazy.gif /forums/images/graemlins/shocked.gif /forums/images/graemlins/blush.gif Other than that (lack of) safety item, at the risk of not sounding modest, it was one of my ideas that worked out rather well.
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