"A special retainer ring securely stabilizes the main bearing to prevent bearing play" instead of the double bearing setup
Just read this. That ring is just a bearing retainer. All dual cases on the market including Inchworms and A/A use bearing retainers. That is nothing new under the sun.
It's very simple to understand. Bearings have two races: A fixed outer race, the ball bearings, and then the rotating inner race. The "special ring" holds the bearing in place by "locking" or pressing the outer race of the bearing to the adapter. It can't hold the inner race because this race must spin freely for the coupler to rotate.
The performance of the bearing to hold fast the coupler and minimize the risk of coupler-and-input failure (strip-out) has NOTHING to do with how the outer race of the bearing is held.
Weld it in place if you want to. It has everything to do with how well the bearing can support it's inner race.
Here is the difference between the bearing TG uses and the bearing Marlin Crawler uses:
And here is the comparison of their ability to hold the coupler with minimum axial movement:
If the bearing can't support the coupler, and the coupler moves and wiggles under load and coast, then it will be rubbing and grinding against the input gear prematurely wearing both of them out.
To compound the problem, compared to our Chromoly design, TG couplers use an inferior material. So not only is their bearing unable to support their coupler, their coupler itself is weak.
Here is what you get with a Marlin Crawler:
Bottom line, if you want a cheap dual case adapter that won't last as long as it should, then buy the one that comes with a "special retainer ring".
Regards,
BigMike
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