You would need to push the large cross pin out that holds the idler gear cartridge in place, which would enable you to access the shift fork retention screws. There is no D300 shortcut disassembly procedure.
Also I used a large socket(it was something like 7/8" or 15/16" or something) that was damn near the same size as the cross pin to hold the needles in on one side until the cross pin can be driven all the way through. Same idea as a "dummy pin" or whatever the proper tool is:laughing:
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