A direct-replacement set of aluminium spring caps for HPI Savage 21 170mm dampers. The set includes 4 caps that locate at the shock top where the spring sits, giving a more robust seating surface for setup work.
Material and role: constructed from aluminium to deliver a more rigid spring seat than stock plastic, which helps maintain preload consistency and limits deformation under load during aggressive off-road driving.
Installation notes: these caps mount at the shock top after removing the original seat. You will need basic tools such as a hex driver and a soft-jaw vice or padded pliers to protect the finish; fittings are not included.
Tuning context: hobbyists fit aluminium spring caps to improve spring alignment, make preload changes repeatable and stop springs from shifting during cornering or landings. It is a simple upgrade for Savage 21 owners who want a firmer interface without altering spring or damper internals.
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