My old Ford needed two full turns on the spring.

Guess that's why my DIY projects look so bad.

Yeah, a buddy of mine had a close call like that. His regular sweep did the quick look for years, then a new guy with a camera found a huge gap in the mortar between the flue tiles. It was basically venting heat straight into the wall studs. The first guy missed it completely. My friend said the extra fifty bucks for the scan felt stupid cheap after seeing that picture. It's not about finding dirt, it's about finding the problems you can't see with a flashlight from the bottom.

Honestly, why not just work from your apartment? Tbh those cafes are a trap for productivity.