For a cat tail or switchview, try a "Breakaway Coaster". 2 for $17.79
NC1 "Universal" Black Coaster Clips from Breakaway. They're used to secure a reel to a rod. Order them here. I use one on my Tac30 1-4x and MTAC 3.5-10x. Less than $20 for the pair (not sure if they're still sold as pairs).
The knob part turns to tighten them down. Once tight, use a sharp razor to cut the excess off.
Here's a (lousy) pic of the one on my 1-4x. You can see the knob right above the Burris logo on the ocular:
on my pst