Does it rotate so that it can be tightened without pointing at a spoke?
Does anyone know what the spring is for?
I like that bike wheel idea.Honda sells a 90 degree valve stem (from the Gold Wing) for $20 that is made for these LDL sensors. Murph used to carry them, but I don't think he has anymore.
VALVE ASSY., RIM
42755-MCA-R31
Honda 42755-MCA-R31 - VALVE ASSY., RIM PLEASE REFER TO BULLETIN MTB55 : LeMond's Motorsports
lemonds.dealerspikeparts.com
Swinging the sensors on a string is a good way to smack one against something and break it. If you really want to test them that way, I'd attach it to a bicycle rear wheel with a zip tie and/or tape, and then turn the bike upside down next to the motorcycle and crank the rear wheel until you get a reading.
Also, be aware that sudden shocks or jolts (like drops) to a sensor can ruin the accelerometer in it and cause it to fail later.
I have more bicycles than I do motorcycles in my garage...I like that bike wheel idea.