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Polarstar Gearbox Shim Kit


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These sets of precision shims are used to secure an HPA cylinder within the gearbox shell to prevent unwanted movement. Since the pins in a gearbox shell can vary in size depending on the manufacturer, we have to make the matching holes in our cylinder conversion kits large enough to accommodate the largest diameter pins. This can sometimes allow the cylinder to shift backwards or forwards in gearboxes with smaller diameter pins if the shell does not clamp onto the cylinder firmly enough to secure it.