You might try the bounce video way. It would be a pain if it lock every time when you are working / drawing back all the way. Been years but if I remember draw it back and at the last moment let the control lever go don't hold it. Helps if the crowd is folded and bucket is folded up for transport.
Seems like the Case's I have run you have to do like the Video and bounce them up there. See how he released the control and then went forward with it and it locked. Take a couple of times practice but once you learn you got it.
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