What's The Technical Term For This Device?

Threadless stem or quill adapter. Try bikeparts.com for a number of different sizes.
 
Thanks for the tips everybody.

Yes, I know I can make one, but in thew interest of expediency I was hoping just to a variety of sizes to buy.

Have a lot of other things to fabricate for an emergency project at work.
 
Update from the original poster:

Below is what I ended up using. The task was to measure the angle of a car seat recline angle, forward and aft.

I used a hardware store variety expanding rubber plug to mount a digital inclinometer. I inserted the rubber part into the hollow tube, tightened it down, and mounted up the sensor.

Works good.

Seat_recline_inclinometer_annotated.jpg
 
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