Not everyone will be familiar with those modules.
It's a metal cone. If the hole is tiny just fill it with a clear sealant like this: https://www.halfords.com/motoring/p...LS*MTcxMzg5ODI4MS4xLjAuMTcxMzg5ODI4MS4wLjAuMA..
If the modules have hung vertically for years with the same orientation, then it's time to rotate them 180 degrees and hope that gravity will recenter them.
It's a metal cone. If the hole is tiny just fill it with a clear sealant like this: https://www.halfords.com/motoring/p...LS*MTcxMzg5ODI4MS4xLjAuMTcxMzg5ODI4MS4wLjAuMA..
If the modules have hung vertically for years with the same orientation, then it's time to rotate them 180 degrees and hope that gravity will recenter them.
Thankyou for your advice! I have turned my dipoles using these speakers upside down and I shall be buying some sealant. The hole is 1/8 x2/8ths
That sounds suspiciously flat screwdriver blade size to me!
I've been researching these modules and, for the record, will supply some information regarding their rear suspension.
Instead of the usual spider, the voice coil is suspended on three Beryllium cantilevers, two of which carry the signal to the voice coil.
The 3 wire cantilevers can clearly be seen in attached image (courtesy of @woody) where the cone has been removed - not an action I advise you to do!
Read about the modules here: https://www.drmarksays.com/category/the-jordan-watts-loudspeaker-company/
Attachments
The spun aluminium cone is very thin.
To avoid damaging the cone, apply the merest smear of sealant with the minimum of pressure.
It may be a good idea to practise on a hole in some kitchen foil first to get familiar with the sealant's properties.
Do let us know how it goes.