Piston, steel teeth + aluminum head, SHSPiston with steel teeths for the gearbox. 2, 3, 6 and 7 from the SHS (ref. T&D). The piston body is very Lightweight and durable polycarbonate, while the most stressed comb has a full steel teeth. The whole set also includes a metal vacuum piston head with the bearing. Bearing on the piston head prevents undesirable twisting of spring.
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