I've adapted my OP case to save keep pulling the 'Wheel' on and off.  I tend to always have the 'Wheel' attached as I use it a lot.

Ok, I've lost the strap but the OP is a snug fit and shows no sign of falling out of the case.  The main thing is that it still fits in my pocket and is well protected.

I used a very sharp knife (VERY CAREFULLY).  A Dremel would have been better but I don't have one.

Hello and good day John Walker. Thank you for sharing this information with us and thank you for your support. Very innovative.

Good idea !

An elastic band would replace the strap.

Good DIY, as fansfe82067d said, a rubber band will do the job as the strap. Now you can see the LED while charging.

Some Velcro would do the trick..  :-) |Cheers from Canada

Excellent idea