I have never used Flexwatt so everything I have is with UTH's. For the tubs that have an indented bottom, The probe will fit between the heat source and tub without causing much, if any, wobble.
My current set-up, I have the probe mounted to the bottom of the tub, and the UTH mounted over that...
It's quick and easy to do, but it is inconvenient when it comes cleaning time, because you have to deal with the cords, and if you need to wash the tubs out, you have to remove and re-attach everything. To avoid having to do this, you can simply mount the probe and heat source to another surface and set the tub on top of it. In these photos, I am using some melamine shelves that I bought at Lowes and had cut to size for a project I am working on.
Tape the heat source down. Tape the probe to that. Set the tub on top and it sets flat...
Since some of my tubs have different or plain flat bottoms, I needed a way to mount the probe to keep the tubs from wobbling on the probe. My solution was to route a channel into the wood with my Dremmel tool, which allows me to recess the probe under the heat source, and the tubs still set flat. These photos are just mock-ups of how the final set-up is going to be.
The probe slot routed out...
The probe mounted in the slot...
The heat source mounted over the probe...
I still have a few more bits and pieces to get before I do my final assembly but that is how I plan to set up the t-stat probes and UTH's...
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