As stu posted above, it sounds like you have the one way pulley on the front layshaft. The one in the middle of the two alloy bulkheads.
On the one way pulley, there is an 'o' ring, or should be.
If you move this 'o'ring off the pulley, there is a hole through it which aligns with a hole in the layshaft. If you don't want to run the one way, you put a drive pin in there and put the 'o'ring back to retain it. This locks the one way.
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