Shimano XTR M900 Cassette Spacer Thickness

[Once A Hero]

I seem to have misplaced the spacer that sits behind the cassette on an XTR M900 freehub, and as a result my cassette isn't filling the freehub body enough to be retained by the lockring.

Can anyone tell me what thickness the spacer needs to be please? so I can order appropriately.

I've got a 2mm and a 3mm, both of which are too thick. Just don't know if I need a 1mm, 1.5mm or something else.

 

[Tesseractoid]

Hmmm. These might help ?

Exploded Hub
https://si.shimano.com/de/pdfs/ev/FH-M900-1193/EV-FH-M900-1193.pdf

Exploded Cassettes
https://manualzz.com/doc/53869124/shimano-cs-m900-8r-sproket-kaset-exploded-view

https://manualzz.com/doc/53869123/shimano-cs-m900-8q-sproket-kaset-exploded-view

 

[Once A Hero]

First thing I checked - but doesn’t show spacers where needed, behind the cassette.

Here’s some pics of the situation;


I tried a Type P and a Type Q cassette, both have a slight gap. Should have measured it at the time but forgot, so thought I’d check the diagrams then ask on here.