68-69 A Bucket seat Release Knob

I looked at the ebay listing ( just nosey ). Their keeper doesn't look like much. I would be tempted to go ahead and put a set screw in their knob too.
The OEM knob is quite heavy for its size. Engineers had weighted return in design? Is aftermarket knob the same material or weight? That bob weight plays into the eventual failure of the keeper? We can assume using the release 2 or 4 times daily was a factor.
My general opinion of all reproduction parts...
It's purdy . We've all seen their fit, form and function fall short of the mark a bunch of times. Good luck