trivial pursuit: found it. the dust boot on the cable aduster, Shimano mt rear d?

[eddief]

I was wondering what that rubber boot cover is called and if it is available as a spare part? I usually remove them anyway, but have another application where I could use a couple of the big ones over the adjuster.

http://www.flickr.com/photos/jovanpuyo/1457034558/

[eddief]

found in Shimano tech doc.