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One I have used for years is 3/4" re-bar about 5' tall, 6" Tee on top and a chisel welded at the point. Has not let me down yet........
, try the search button I believe there was a thread on the subject but I could be mistaken ,
Mistertwister, what are you using for a wrist strap? Hook it up before the first thrust or it could be gone. Deep !