The pins aren't supposed to be removed. The screws would be loosened enough to get the band over them. Try soaking the band screws with penetrating oil. Then with a properly fitted screw driver, try turning it in both directions. Give the screw driver some taps. With a screw driver bit in the slot, heat the bit with a torch. It will transfer heat to the screw.
Also, look up british militaria forums, on tapatalk, for help. If nothing else works, you can run a dremel cut off wheel through the band slot and replace it
john
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