Hello everyone.
Does anyone know the thread type of the small screws which hold the lower frame bar to the upper section, using the angle brackets? I have broken some (rusted in) and need to drill and tap them again. The thread outside diameter is 3.5mm. There is a thread test board at the local hardware shop but not for small sizes.
It might be UNF or even BA. I could take them out to 4mm metric but would prefer to keep the same size if it can be identified.
