Somehow, I figured it out the first time I read it. From context, I guess, like "puttin' the blocks to," and "stemmin the rose."
Slightly OT: I also recognized Alison Janney, later/late of The West Wing, in a small role as a police officer.
"Jack said his father had been a pretty well known bullrider years back but kept his secrets to himself, never gave Jack a word of advice, never came once to see Jack ride, though he had put him on the woolies when he was a little kid." (Italics added.)
(http://i79.photobucket.com/albums/j125/yaadpyar/SheepRider.jpg)
Poor kid looks terrified!!!