Hello Everyone, I'm the new kid in town having just acquired a model 6718 serial number 2623 of unknown origin! My first problem ( and I am sure not my last...!!) is as follows. The diaphram on the air seat is perished and split. Does anyone know where to source a replacement as I definitely can't repair this part! Also if anyone has any idea of the year of manufacture of my tractor I would be interested to hear from them. ( The seat diaphram has 1972 moulded into it....??) Thanks for all the useful information in the forum, the handbrake discussion has helped me to understand the braking system which I have yet to get working!