There is a little variation in these clips. We suggest installing a pair that feels stiff and requires you to first adjust each clip with an ESCC leg as shown in the AVS clip installation video. This way when you install the ESCC it will fit in firmly, not wobble and maintain stable resistance readings for a long time. We have also found using the Zirconia cup increases the amount of reclaim which collects underneath the clips so are not using the M22 ESCC with this part.
If removed without damage these clips can be soaked in ISO, rinsed, dried and re-used/ re-installed at a later date. In this situation there is no need to replace them every time.