Replacement for Losi a5010 Spring Cups (Rear 5-Link) - 3D printed part. This part has been created in a way to prevent the shock shaft from pulling out and to prevent the part from splitting open near the link mounting point. - The shock shaft hole was specifically made very tight to prevent the shaft from stripping out during crashes. It will be very tight when screwing shaft in. Put a small amount of shock oil on threads and use a good pair of pliers to grip the shock shaft. Needle nose pliers may not work. - This version will work with the Jrx2 and Jrxt. See a5010T for thicker Jrxt only version.