Ever since I fitted the main engine loom through the dash I'd never been entirely comfortable that the only thing holding it central was the rubber gasket I'd used to to close the hole. Seeing what Martin, another builder had done, inspired me to make some improvements. Firstly I mocked something up in paper which was formed along similar lines to the original stainless ring I had in place but rather than cut the centre out, I planned to make a partial cut and bend the centre forward making a tab to secure the wiring to. Once I was happy, I bought a small sheet of stainless and transferred the dimensions onto some masking tape stuck on the back.
I started by drilling all the holes before making the cuts with a metal blade in my jigsaw. Taking it nice a slowly I gradually cut along all the lines before bending the centre "tab" forwards, putting a small curve into it and tidying up all the edges.
Then it was just a case of removing the original backing ring behind the bulkhead and replacing it with the new one. The oval holes I cut into the tab allows a ziptie to be passed through and secure the loom nice and tight. The gap at the top of the new ring allows it to be placed around the loom rather than having to pass the loom through it.
Worked perfectly, whilst there are no sharp edges I will probably go back at some point and spend a bit of time really rounding them off just in case.