Changing the elastomers is easy and is best done while the ShockStop is on your bike. 

Simply remove the faceplate and handlebar, push down on the top of the ShockStop while unscrewing the pre-load wedge, replace the elastomers (make sure they are on the top in whatever orientation you choose), and screw back in the wedge while pressing down on the top of the ShockStop. 

We provide detailed guidance on how to do this in the instructions and the installation video which can both be found in the "instructions" tab on the ShockStop page on the website.