First, what kind of vehicle do you have??? Second, why a mag mount for hf anyway?? Give us more information so we can help you!!! You can make anything as long as you keep an open mind. If you have a pick-up, you have several options available. If you have a car, you still have some options to work with. Trailer hitches make excellent antenna supports. They make mounts that go in your truck beds stake pocket. NO HOLES REQUIRED!!! On a car, MFJ makes a lip mount that will work on your trunk lid or a rear hatch of a mini van or SUV. Get the picture?
Use the internet to your advantage.
Good luck and 73