Martin Eastburn fired this volley in
:

One could get some dope or varnish and drip into the area
and re-coat the fins into a firm position.

They weren't 'coated' to begin with... they were vacuum-varnished.

Knowlegeable and judicial 'wedging' is the way the noises are settled in
a real motor shop/lab. Occasionally, you'll see an entire frame go back
into the vacuum pot.

Lloyd