Shimano M770 Hollowtech II crank pinch bolt washer

[Gixxerman]

Whilst in the process of replacing my bottom bracket I rather stupidly took the pinch bolts out completely instead of just loosening them. I then even more stupidly dropped one of the washers from off the pinch bolts. It dropped on the back lawn and despite searching with a really strong magnet (yes they are magnetic as I tested it on the other washer) I cannot find it. The washer looks to be slightly domed. I'm not not sure if this is actually a domed washer or just a standard flat washer that has just becomed domed due to being under stress of the pinch bolt. Anyone know what sort of washer it is? I has tried my stock of washers, the LBS and a local equip hardware store and no one has anything similar. Can't find owt online either at a sensible price. My washers are too thick and are wider too. Anyone happen to have some laying about that that I can cadge?

 

[si_c]

It's a domed washer as default, so as the picture shows above.

The washers should be fairly universal - not sure of the thickness, but the bolt is M6x19 if that helps narrow it down. You can replace the bolts and washers with Shimano spares - the part number is Y1G398010, however there doesn't seem to be much stock around - SJS Cycles would be my go to normally for something like this, but they are currently showing out of stock.

 

[Ajax Bay]

what sort of washer it is?

It's a doomed washer

 

[Milkfloat]

https://www.ebay.co.uk/itm/191815279489 expensive though

 

[Gixxerman]

Found some on BikeParts.co.uk for £5.98 for 2 delivered.
Thanks.