Hi,  A close friend of mine has a Mason & Hamlin upright T-100
Welte upright.  Unfortunately it has stopped playing and it
has been suggested that the cut-off valve is stuck.  Unfortunately
he doesn't know where to find the cutoff valve or where to start
looking.

If anyone has an upright T-100 and could help, please contact me.
A picture of the location would help, any suggestions are welcome.
How does it tube up and how do you access it?

1000s of thanks, Best regards,
Eliyahu Shahar