No substantial difference in terms of action of the bag and punching experience among these three swivels.
Loudest swivel: Mexican-style - built like a tank AND SOUNDS like one when you are hitting the bag. But no big deal.
Fastest swivel (everything else being equal): no decernible difference in speed among the three swivels.
Best quality and craftsmanship: super swivel is put together very tight with respect to the way the bolt fits through the u-bar and the way the u-bar fits on the swivel mechanism. "Snug" is how I would describe the relatuion of the parts fitting together.
Quietest swivel: Super swivel (due to the tight fit of parts - no clanking of loose metal/steel)
Locking pin: the locking pin on the super swivel and the mexican swivel is easy to pull out and insert. The 4444 locking pin requires a tool to push/pull out and for insertion. I learned this lesson after nearly puncturing my skin trying to push the pin back into the 4444.
Smoothest swivel: super swivel has the smoothness edge over the 4444 and a big edge over the mexican swivel.
Notice the two pics of the super swivel - one was taken with the swivel mechanism pushed up into the housing and the other with the swivel mechanism pulled down. Is this normal? Is there anyone who has a super siwvel and is able to push the swivel mechanism up into the housing?
BOTTOM LINE: If you are looking to buy a u-bolt swivel just go down to your local sporting goods store and see if they have the 4444 in stock. Save $20. The super swivel is built like a tank but you don't need a tank to hit a speed bag. I want to point out that I bought my 4444 from Dicks sporting goods about 6 months ago. It was the only u-bolt there, mixed in between a dozen everlast chainlinks. I recently went to dicks and they have nothing but the u-bolts, and I examined about a half dozen of them. I noticed some differences in the craftsmanship between the one I bought and the ones they currently have (mine has grooves on the sides of the swivel mechanism whereas the current ones do not, and some of the u-bars on the current ones were victims of bad welding jobs with respect to the holes welded to the u-bar where the bolt fits through.
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