http://www.stormcam.org/strap-tomtom/
How do I attach a wrist strap to my Tomtom one V4. Am I stupid or what?
The problem is that there does not appear to be anything to loop the strap through yet the case and strap are designed for the model.
if there is a hole in it where the strap goes, slide the whole loop through the hole, then while its half through the hole, take the other end and stick it through the loop
Leather case and strap for the tomtom one V2 and V3