Please take a 3/32 Allen, back out the set screw for the thumb switch on the "grenade" (at the key), loctite it, and carefully snug it back up. It seems that our bikes have a habit of it falling off, and the 25 dollar thumb switch has been discontinued for purchase individually, and is only part of the 200.00 complete ignition switch assembly.

It might even be a good idea to take a drill and make a small dimple where the set screw touches the barrel for the set screw to rest in.

There's been several people on the FB page for Blackline owners, who've had this issue.