I use the same cup holder as Deermagnet, and mine is held in place with double-sided tape. I trimmed the bottom to get a tighter fit and also trimmed the side away from the brake handle to allow more room for my mug. I've had to hit the brakes pretty hard with a full mug (20 oz, I think) and it held fine with just heavy-duty double-sided tape, not the velcro that came with the kit, but the tape used by RC modelers to hold servos and electronics in their cars.