Rusty Rustermier reports that it appears that screws hold the driver springs in place on the GS-4 frame. The holes the screws go into are not threaded. Instead of threading the holes, Ajin drilled the holes oversize, put superglue into the hole, and then pushed the screw into the hole with the driver spring.
Be aware when taking this model apart; clean too aggressively and the screw and spring may be hard to find again!
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