As we all know the UT 800 Garmin light rattles in the upsidedown 1040 attachment and eventually falls off your bike. I found this replacement for out of the box factory attachment from Garmin,  for $15 bucks in Amazon the issue is resolved. 

As we all also know Garmin's Customer service will not resolve nor listen nor address the issue like with every other product or device. Customer service sucks sucks and sucks - I was told to go to Wahoo or other brands because Garmin sucks. and indeed after throwing almost $ 1300 bucks the light, the computer the this the that have faults/does not function properly. 

Look for:

Interface Combo Adapter for Garmin Universal Flush Out Front Mount Quick Release Adapter Compatible with Camera or Headlight