The principle of operation of this tool is quite simple. It's well built, but the two round posts that are supposed to hold the joists are painted smooth, and it slides over pretty much any joist. I had a roll of self-adhesive backed anti-slip tape and taped these pieces on and everything worked great. I'm not sure how well the "updated" version will work or how long this stuff will last. My solution works, but over time the tape wears out and needs to be replaced.
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