The shape of the spring guide has been modified compared to the standard one installed on the replicas on the market, the main shaft has been lengthened and slightly widened to provide greater stability to the spring in the pre-compression and release phase even at high speeds, while at the tip there is a progressive narrowing of the shaft which makes it compatible with all springs on the market. We recommend the use of the QD TopMax bearing spring guide with TopMax RCS springs as it has been designed to obtain a perfect coupling.