Have you ever tried IronMasters? Or their cheaper "cousins" that don't adjust quite as quickly Pepin dumbbells? It's like your typical standard spinlock dumbbells, but instead of spinning collars onto a threaded bar, you spin the threaded rods with flat endcaps into a central handle. So they take 60-90 seconds to change weights, but they can use standard pancake plates, and function exactly like pro-style dumbbells. And you can load them up with a lot of weight if you have the thin 10lb pancake plates. 60-90 seconds between sets may not be optimal for people who want to do supersets, or dropsets, or change the weight between every set, but if you're going heavy and resting 90+ seconds between sets, or doing multiple sets with the same weight, they're IDENTICAL to pro-style dumbbells from a functional and feel perspective IMO. I have the Pepin dumbbells. IronMaster ones just make the changing weight process faster, but are similar beyond that. But I think they're more expensive and have to be bought WITH plates, while Pepin sells handles without additional plates, which is great if you have some already, or buy them on their own. I even bought a pair of used Troy pro-style dumbbells and stripped them for the sweet 10lb pancake plates! They look pretty nice too.
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