Every sailor should carefully inspect his runners after sailing not only checking for edge quality, shim tapes etc. but also for eventual delamination. It may happen that runner body exposed to extreme loads during sailing will delaminate from steel. Above picture represents this situation. You can see a very tiny gap between carbon flange and blade. If we fix it the runner it will be fine, if we continue sailing the water will be absorbed by the wooden core and body will begin to swell.
Here is quick and easy solution to fix it.
Take care of your runners at all time. Short glance costs nothing and saves a lot of problems.
If your runner unexpectedly doesn’t nicely snug into chock any more it may be too late for this easy fix and new tutorial will be needed. I hope not.