26-06-2021, 10:14 AM
(26-06-2021, 08:36 AM)Malcolm Parker Wrote: Thinking back forty some years, I seem to remember that the Moseley cushion in my Ruby did not have valves, it had red rubber plugs that were a push fit into a rubber tube. All had perished and gone sticky like old rubber does.
Yes, that's what they are; not "valves" but exactly as you describe. One is intact and works, the other is, unfortunately, perished. Still, it is 87-years old.