I just looked at the picture of the hole opener with the bit 'lugged' on bottom. In my opinion that is NOT the right way to lug a bit.
Welding a strap across the bit and onto the H/O is asking for a fishing job. If the bit is not torqued up properly, and hits bottom, or something hard, it will 'make-up', shearing the strap. Then as soon as the bit goes into clean pilot hole it will backspin off and fall in the hole.
The better way is to weld a strap to the H/O body ONLY, extending down on to the bit a couple inches, but not welded on the bit. Then weld a lug on the bit on the right side of the strap. This way, the bit can make up if it needs to, in the hole, but it can't back off because the strap hits the lug.
Been doing it for years, and never 'planted' one. Works with multiple H/O stacks too.
Tags: Hole, bit, fishing, job, lugging, openers, strapping, the
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