If you want to use your Garmin Edge bicycle computer with the original quarter turn mount on a thin bar it wont sit tight. Use this adapter to increase the diameter on the bar to regular bicycle size (31.8 mm). Made to fit ~12.9 mm accessory bar, such I have on my Honda motorcycle.
Model diameter is 12.5 mm to be tight, if you want it more secure, use a piece of double adhesive tape on the bar.
Additional items required: Mount with two rubber bands. Two wooden screws ~4.5x20 mm flat head.

The author marked this model as their own original creation.