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This makes me wonder: Has anyone come up with a way to put the flush part of the fastener inside, and get the nut on the outside? If it is an inch too long, you have a worse problem, but it would be nice to have button head screws on the inside of the tub, and keep all the rest of the fastener up inside the counterbore in the bottom of the Hyfax. Would the pop riveting technique proposed further back in this thread accomplish this? How would you hold it all together tight while you install the rivets?
This is a good excuse to go to Harbor Freight and buy and angle grinder and cutoff wheels. Can't believe how long I went without one. I used mine so much, I wore it out. I now have a Ridgid cordless one, which is even handier. Haven't used a hacksaw in 5 years.
Use these t-nuts on the inside, you can either bend or cut the points so they sit flush with the bottom of the tub.
Where does the barrel part of the T-nut go? Do you drill out the Hyfax?
Correct. Just slightly oversize the through hole in sled and hyfax. You'll want to use loctite as these aren't a nylock.