17-11-2019, 05:33 PM
As far as I'm aware there's no one selling individual spare parts for these early AC pumps other than new diaphragms, sealing washers etc and these seem mainly for the more common 'T' Type pumps. I think it'll be a case of you finding someone with a stash of cannibalised 'M' Types or buying a complete S/H one for spares. Have you tried Tony Betts at 7 County Austins ? - if he can't supply you with a filter gauze, I'm sure he'll have some complete 'M' type pumps on his shelves.
http://www.7ca.co.uk/used_parts.htm
http://www.7ca.co.uk/used_parts.htm