GBC AdvancedPunch Pro Service Manual page 201

11. Remove all brackets from both sides.
If replacing only the Die rail springs, remove only the brackets from
the Alignment sensor side.
12. Unscrew the M2 Screws (4) and M2 Lock Washers (4) to remove the
Springs.
NOTE: If you are replacing only the Springs, skip the next two steps.
GBC AdvancedPunch Pro
13. Remove Nuts (3) and the Chip Chute.
14. Remove the old Die Rail.
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Repairs/Adjustments