Tub Drain Problem

I have two problems with the tub drain. First the nice quality Moen drain that I bought is too short to reach through the hole to a pipe below the tub. It is only 1 1/4″ deep and the opening in the tub is 1 1/2″ deep. The built in overflow in the tub also requires a hole in the drain similar to a sink drain.

Drain too Short

Drain too Short

Most of the tub drains I have researched are at the most 1 1/2″ deep. There is a Mountain Plumbing drain for $100 that requires a 2″ opening in the tub and ours is the standard 1 7/8″ opening.
There is a Jalco 3″ drain with a hole for a built in overflow that is $100 on Amazon–that is the reduced price. But it is a toe touch pop up drain and I would prefer the lift and turn model.
Finally there is a Barclay straight pipe drain that was $56 on Amazon. It does not have a hole for the overflow but I believe for $44 I could cut one. One vendor shows the threaded area is 2 1/2″ long which would work for the tub, but it does not say whether it has fine or coarse threads. I’m thinking it will have fine and I’ll have to figure out how to attach to the metal extension pipe that comes with it.

Barclay Drain

Barclay Drain

I want an assembly that will extend with proper drainage from the middle of the tub where the drain is located to the floor drain about 36″ away. That is only a required 3/8″ drop so I should be able to get it if I can find a drain that will extend below the bottom of the tub but still allow for proper downward slope to the drain.

Tub on Flagstone Blocks

Tub on Flagstone Blocks

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