Just a bit missing. As said, that shouldn't prevent screwing it in. To get the thread started, try initially rotating the glass slowly anti-clockwise until you hear/feel a slight click, then rotate clockwise.
Thanks again. Fiendishly difficult to start it square on, as right at the back, in the corner, no room to manoeuvre. I’m just worried about repeating earlier error and either over tightening, or heat causing it to stick etc. Don’t think I can rely on Baby Boar to bail me out.
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