It is this Crank Brother pump...
I may have figured it out, one of the "caps" at one end does appear to unscrew - that might be how I can use it for the schrader valve. My other bikes all have presta.
OOOOOH I see it now! There are little "symbols" for the two kinds of valve, one by each end. I've no idea why I couldn't make it work but I am quite sure it was user error - will try it againI would much prefer it be my error than to learn that I can't use my $30 pump on my mountain bike!



I would much prefer it be my error than to learn that I can't use my $30 pump on my mountain bike!
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