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Baader, on their website, publish a discussion about thread sizes for filters and suggest that all standard thread sizes manufactured are not exactly the same and a pretty loose standard exists. As we know , 0.75 tpi does not often measure at that exactly. So they have created their own standard which roughly matches all the known brands so the filters will fit every manufacturer except perhaps the worst. I have a set of three t2 celestron identical new OAG adaptors and one will fit a chinese t2 / m48 adaptor and the others will not go past a few squeaky threads.
I wish I was game to try the boot polish but knowing me I will have boot black every where. Perhaps a different colour and then I could see if it was escaping the thread.
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