Dunk,
Thanks for the response.
I believe that with only my 0.5 mm to spare, I can't put in the filter as I can't reduce it any further. However, there does seem to be somewhere inside the Flat 61A where a filter might go. See attachment.
As per normal with most things, there is no label on the inside diameter. I think it is a 42 mm thread but I can't be certain. Also, I can't see an easy way of threading it in if it fit.
The M48 thread is where my OAG screws on.
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