how to change Convoy C8 tail switch

Hi all I wish I knew how to post pics I have a host site with photo bucket and I still van only get about 10%of photos to cone up ,anyhow I have a convoy C8 1st version with the removable pill well I fried my tail switch and I can’t get the retaining ring out is there something obvious Iam missing?

I just received a NOS C8 this week with a removable pill.
The tail ring on mine has left-hand (reverse) thread.

Have you looked this thread ?
Convoy C8 tailcap:

No seriously never thought would have thought about reverse thread $Seriously thanks uou all for the great feedback