Not Ranked
I also have a TuffLift hoist and it has been installed into a 100mm slab in a shed that was here when we bought our house so no idea of the concrete strength. As such and for peace of mind, the hoist has been positioned such that it is also braced at the top of both uprights. Otherwise, the concrete would have been cut as above.
Geof
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Original? Must be. It's the only one I've ever built.
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