Stroke sensor on rowing machine not working.

[Dpfenny]

The sensor attached to the wheel on my rower is not registering strokes. I took the cover off and noticed one of the two “sensors” was loose. They were basically hot glued into place.  After adjusting on the loose one for a few minutes I finally got it to register strokes. I rowed for a few minutes and every thing worked fine.  I grabbed the hot glue gun and plugged it in. While I waited for it to heat up, I decided to remove some of the excess hot glue that was hanging there.  I went to test it again before I applied the hot glue and it would not register the strokes. I am not sure what else to try and am unsure where to even find a replacement part.  The manufacturer was of no help.  I attached a pic of the sensors in place and another of the sensor that was loose. Part of the plastic is broken off.

[fzabkar]

I can't make much of the photos, but could the sensors be reed switches, and are there magnets on the wheel? The reed switches should click when a magnet is placed in proximity.

[Dpfenny]

I think these pics might help.  The wheel has three contact points. The wires are connected to tje piece I adjusted as well as one right next to it.  Thanks for taking a look at it.

[fzabkar]

It should be easy to confirm whether the three "contact points" are magnets. The reed switches can be tested on the resistance range of a multimeter. The resistance would be either 0 or infinite.

Here is something similar:

https://www.ebay.com.au/itm/254010855539

I guess that the reason for two sensors is so that the microcontroller knows which direction the wheel is turning.