How do I get rein stops on my laced leather reins?!

I recently got a new bridle with laced reins and I need to get rein stops on, preferably leather but when I tried I couldn't get them on!
Does anyone know any tricks for this?

If they're rubber, try letting them set in hot water, not boiling but as hot as you can get it out of the sink. Let them soak for about 10 minutes, then try pulling them on.

If they're leather, you might try using some oil or conditioning balm to help them slip on.

If that doesn't work, then buy the kind that have snaps!
Koper Equine| Products
Koper Equine Easy On Rein Stop - Quality Tack at Outlet Prices - VTO Saddlery

Thanks!

Those are really neat...I've never seen them like that before. :)