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The reason no one has produced a cheap knockoff is most likely that it would be difficult to do inexpensively and safely. That big semi-circular piece is actually a piece of machined steel that has contours that fit the engine case exactly. Steel takes some time to machine, and time equals $. The male portion that fits into a standard engine stand (yes, it fits into mine) is also a piece of machined tubing. The four arms are mandrel bent and the welds are strong.
I'm only guessing at the method of manufacture, of course, but as a manufacturing engineer who quotes all jobs that come into our shop, I decided that it wasn't worth the bother to try and make one. Maybe if I had firm orders for a thousand units I'd give it a go, but for now my advice is to bite the bullet and buy one. It is a well made piece.
Jim
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