The threaded outer casing of the group head valve seized in the group head block, so I had to drill it out. Thread in the group head block is mostly intact and will be fine, just needs a tap running through, but I just can't find the right thread size! Tried M13 with 3 thread pitches 1mm, 1.25mm and 1.5mm, but none are correct. Suspect its an imperial thread.
The imperial equivalent seems to be 33/64" and thread pitch looks to be 18 tpi, but really hard to be sure from measuring.
Does anyone know the actual size?
This is the group valve I'm trying to match the thread for:
The imperial equivalent seems to be 33/64" and thread pitch looks to be 18 tpi, but really hard to be sure from measuring.
Does anyone know the actual size?
This is the group valve I'm trying to match the thread for:
