Very nice design. Didn't fit my hammer as well as the one pictured... but still holds it firmly.
Update: changed to 5 stars for sharing the source design.
No worries. You shared the Step... so I made a quick edit in Onshape. I really appreciate when people export the step files for modifications like this. Thank you.
If anyone who downloads and prints this model experiences any problems with it in their own personal environment and finds it unusable, let me know. If you need an extra 2mm here and/or there - just let me know, if you want any minor modifications to be made just ask me and if there is a good chance i will be able to make the change you need and fairly easily be able to quickly and easily modify my model for you, i will be most happy to help you. but note that even if you worry your task is too hard or onerous for me to fulfil within reason, worry not - you never know until you ask.