What a messy job! Crimp the resistors aswell as solder, come on you alarm technicians all easy stuff circuit building?
You will need quals to build that I reckon
Could still do with a decent cat5 stapler though , it's rough trying to clip through a loft spaces lol
You all using clips? Or p clips? I used some cable ties with eyelets for bunches works ok, or is that a no no aswell?
I experimented on some cat5 stapled on bench perfect every time , soon realised cat5 isn't like 8core doesn't keep its shape aswell , clipped it in the end
Also if wood is very soft staples don't hold very well depends on type of wood aswell
Is there an adjustable gun? Ie Staple sizes
Why can't you cut the ceiling? After all you should have run 8core every where , use Polyfila after sand down paint
Then connect your bell
There must be a way or another route