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Most likely it is popping out of second when decelerating. That's tired transmission insides, not a shifter issue. It's generally repaired by replacing an original slider with a replacement one that will do a better job of holding things in place and not letting it pop out. The way the gears are stacked on a T-10, there is much greater susceptibility to wear than in a Muncie.
As Mike points out, problem is generally with the second gear synchro teeth "wearing down" over time. There are special slider gears that can help with this problem, but as the whole trans has to come out and apart to install them, might as well invest in a new second gear at the same time.
To directly answer your question - The adjustment procedure is in section 12-29 of the 1961 Chevrolet Passenger Car Shop Manual. Having said that, I agree that a bad syncro is the problem.
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