Owner has managed to get away with dragons teeth retaining clips digging
into the glass envelope of his replacement type with no bakelite base . How
to fabricate something approximating those woven glass mesh baskets that go
over the envelope and then a pair of springs down to the chassis or any
other ideas other than replacing with based envelope types ?

Incidently the first thing I did was undo the screws of the dragons teeth in
hope of relieving some of the teeth force before removing the valves , but
was that the correct approach?