the only really good info I could find on 4600CB, other than Abu schematic and ebay listings, was off the Goober Reel Works bench ('81 mod-0) in Japan, and it shows a normal synchro reel -- well, ok, a really hot raced-out one.
https://www.youtube.com/watch?v=uA7I_5JdMkY&t=65 -
I tried, no luck embedding this. Back to the generic use of beetle spin to describe a type of lure - that's probably colloquial, and makes sense.
As I said, I'm sure I have a disdain for the specific brand lure, and would find any other generic name to use.
The spinnerbait rack in the old tackle box in the masthead photo on this forum page still has the few examples I bought twice, 15 years apart, and never caught a fish.
Regional generic for the larger bass lures of this basic style, along with the smaller finesse versions, have always been "safety pin" spinner or just spinnerbait.
(on BR forum, Finesse spinnerbait is a category moniker)
Compared to my bottom-bouncing inline keel spinner, the 3-D target of a safety pin is more effective in deeper water - it presents to the fish as a larger moving bulk, and a very effective shad or lost bluegill shape. I suspect the original intent of these lures was to represent a schooling bait ball, and for small bait, your curly tail would be perfect.
Again, the inline Mukai does the job of a cats whisker on Teeny sinking line, with the added water movement of a Mepps, and makes a more believable offering in a shallow water column.