GR translation: as little finger sweat-cams off M-1 operating handle

[Mike Jing]

V584.5-19   If Katspiel had enough energy to leave the sun’s field forever,
then it has left these kind round beings in eternal exile, with no chance
of ever being gathered back home, doomed to masquerade as ball bearings, as
steelies in a thousand marble games—to know the great thumbs of Keokuk and
Puyallup, Oyster Bay, Inglewood—Danny D’Allesandro and Elmer Ferguson,
Peewee Brennan and Flash Womack . . . where are they now? where do you
think? they all got drafted, some are dead on Iwo, some gangrenous in the
snow in the forest of Arden, and their thumbs, first rifle inspection in
Basic, GI’d, driven deep back into childhood as little finger sweat-cams
off M-1 operating handle, thumb pushing down follower still deep in breech,
bolt sshhOCK! whacks thumb oh shit yes it hurts and good-by to another
unbeatable and legendary thumb, gone for good back to the summer dust, bags
of chuckling glass, bigfooted basset hounds, smell of steel playground
slides heating in the sun),

What does "sweat-cams" mean?
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