The right tool for the job...
This bent-nose plier is perfect for removing and installing the McClicky switch and retaining ring. You can do it by hand but a little mechanical advantage goes a long way in making the process easier and faster. The switch must be installed "snug" to make electrical contact.
This new plier is extremely high quaility and constructed from surgical stainless that has been polished to a mirror finish. I've been experimenting with product from 5 different suppliers, and I've finally settled on this one. It also happens to be the most expenisive, but you get what you pay for.
The points of the pliers engage the slots in the retaining ring (and switch) like a spanner wrench. Nifty right?