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https://jcphardware.co.uk/gaskets-seals/
Theres none that look like a definite match, but you will find one that's close enough.
the 2mm throat will hook in behind a small lip inside the frame so it doesn't fall out.The 3mm is how much gap is remaining between the glass and frame. Too loose and it will keep falling out, too big and it will be a sod or impossible to fit. Definitely not the reddilock.
R9227 is quite a soft rubber
I don't have any of the corded wedge but there's 3 that maybe usable
The sample packs have small 10cm sections, which I find too short to get a good idea. Order a metre
user69121
Sheppz
So mine are old metal frames - no idea how old, house is 1960 - about 35mm overall so i think the glass will be either 18 or 20mm . I've pulled out some wedge gasket. Can't measure exactly but analog callipers give me as below - any advice on where to find replacements if I do try and DIY these ?