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I had a cast iron claw foot tub moved out of a bathroom to remove the carpet floor. The new subfloor and flooring has now been installed. I've moved the tub back into bathroom but in the process of tightening the bolts for the claw feet one of them snapped and I've managed to loose one of the square nuts.

The legs look like the following picture except that the leg retainer highlighted is still attached to the tub. The square nut shown is the one I am missing. Since the square nut is sized to fit the slot it keeps the nut hole centered and allows blind installation of the bolt through the leg to the nut (that is sitting in the retainer). If I have to do this with a standard nut I am in for a world of hurt.

I was thinking that I could glue a washer larger than the slot to a standard nut and angle grind the washer to fit the slot such that the hole is aligned.

The tub currently has two legs installed but the bathroom is small so it is difficult for multiple people to work in the bathroom. The tub is also quite heavy. I was thinking maybe make some cribbing 9" tall (slightly taller than the legs) so the tub is supported while I work on attaching the legs maybe use a car jack to lift it up to install the cribbing. I can as an individual lift the tub up and push something under it.

Anyone do this before?

Any better ideas?

enter image description here

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    Google is showing square nuts still available. If plumbing not attached yet, would just lift tub on it's side to put leg back on.
    – crip659
    May 6 '21 at 1:17
  • Thank you there might be enough clearance to do that without moving it out of the bathroom. I'll see about replacement square nuts. May 6 '21 at 1:28
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    You can buy a square nut assortment for about $10 online. Pick one that fits well, then buy a matching bolt. They have them in my local hardware store too, and probably in yours, the kind of store that has an aisle with hundreds of little drawers full of loose hardware. If you have a store like that you can take the foot there and buy a square nut and matching bolt for about $1 altogether.
    – jay613
    May 6 '21 at 2:27
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    For future convenience you can also check the thread on the existing bolt and buy or order a square nut for that bolt. Another option I've used is to grab some 1/8 or 3/16 flat, cut and tap a hole in it and use an angle grinder to cut it into a square nut. From your picture it looks like the two highlighted circles show a piece that is supposed to be welded to the tub and has broken off. Is this correct?
    – K H
    May 6 '21 at 3:14
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    @FreeMan it sounds like he snapped the bolt, and then lost the nut. Which he will find right after he gets a new one. Square nuts I have used seem to be a wrench size up from hex nuts.
    – crip659
    May 6 '21 at 16:28

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