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Chris
Apparently the plastic used in a 2 litre milk bottle works the best, and I can vouch for that , mine is so much easier to micro adjust now
Can I suggest to cut the oval shape a couple of mm less than your secondary but large enough to cover the area of the base
Also the new custom springs fitted to the primary made a huge difference as well ( they weren’t cheap , cost me about $15 each ) but they will outlast the scope and so important as we all know. The springs that came with scope were extremely poor quality ( as you would expect for a GSO $299 Newtonian telescope)
I had my new GSO 8” f5 fitted with new primary springs as well , once again made all the difference when collimating
Cheers
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