[Al (astral highway)]

Hello everyone,

Thank you for all these very useful comments, too detailed to reply to each of you individually! I've certainly got a wealth of advice here.

I'm quite intrigued to be about to learn two new skills: working with polycarbonate and also threading for the first time. Quite a learning curve!

Thank you also for the advice on the correct adhesive. I will make a note and heed the COSHH advice!