Clutch master cylinder rubber bits

[The Veg]

H'lo gents, long time no see!

 

I'm rebuilding the clutch master cylinder and there are more rubber bits in the kit than in the clylinder.  Specifically, there are two items in the kit that don't have counterparts in what I've taken apart.  They are indicated with red question-marks in this picture:

 

 

The larger one is just a flat ring, doesn't fit anything on the M/C and it doesn't seem to go anywhere.  I'm not worried about that.

 

The smaller one has a tapered outer diametre and I want to know if it is supposed to go somewhere.  No such part came out of the cylinder, but that doesn't mean that the original part might not have completely dis-intergrated, although given how much of the other bits is left I'm not sure of that either.

 

Anybody know where this part goes, or if it's needed at all?

[Wilf]

Is one of them for the brake fluid reservoir cap? May be too small for that!

Edited February 15, 2014 by Wilf

[The Veg]

Problem solved.  The big flat ring is a reservoir-cap gasket, and the smaller mystery-bit is not used as the kit was not specific to this one application.