DDF

It says somewhere they are attached with a small firm ball joint on the lever ends and they seal very well. David.

Here you go,not mine by the way .David https://www.ebay.co.uk/itm/153674196603

Hello,I think you'll find those are two different instruments in your stills.My guess for the one use in the video would be a Wheatstone with wooden ends and nickel buttons? David.

If you need 1 mm these people supply small quantities. https://www.windplus.net/supplies/woven_felt_sheet.html

Superb.I expect you familiar with this one but it always worth another watch.

https://www.ebay.co.uk/itm/Louis-Lachenal-48-button-Concertina-/323799467736?hash=item4b63f3c6d8%3Ag%3A3qkAAOSwCgFc0GIQ&nma=true&si=EdVRvo%2ByNd1FfqJ2I5y0C1qYE6I%3D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557

Google shows this. http://www.jollyrogeraccordions.co.uk/

This should help clear up the name pronunciation and is a delightful watch as well. David.

I have 9008 Geoff kindly told me it was made by H T Crabb in 1927. David.

It opened ok for me @9.25 am,thank you.

I just measured the card in a 12 sided Lachenal bellows from around 1910 and they are 1".David.

I did a bit of reed cleaning and resetting today.I resisted the temptation to bring them back up a few cents to be bang on, as it would be very difficult to replace them if anything went wrong. I also made a new o ring to go under the lid so alls well and harmonious in the tea department.

Almost looks as if some of the valves (in the chambers) are mount on the other end to usual?

Yes solid nickel silver.The only Wheatstone button I had handy was an early one with an ivory core which I guess would be a little heavier than the beech? or plastic cores.David.

Here is a rough comparison of the weights of a Wheatstone button and some made to the approximate dimensions in nickel and titanium.David.