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https://www.amazon.com/SMALLRIG-Mirrorless-Arca-Type-Standard-Compatible/dp/B083QHJ7JR
https://www.amazon.com/Neewer-Aluminium-Compatible-Wimberley-Manfrotto/dp/B00KYEO70Q
I'm a bot | Why & About | Summon: u/AmputatorBot
It looks like OP posted some AMP links. These should load faster, but AMP is controversial because of concerns over privacy and the Open Web.
Maybe check out the canonical pages instead:
https://www.amazon.com/SMALLRIG-Mirrorless-Arca-Type-Standard-Compatible/dp/B083QHJ7JR
https://www.amazon.com/Neewer-Aluminium-Compatible-Wimberley-Manfrotto/dp/B00KYEO70Q
I'm a bot | Why & About | Summon: u/AmputatorBot
So the baseplate is made from several different pieces. The arca swiss mount comes from this camera bag strap mount as it's square and ant-twist. The strap mount is a bonus!
Next is the baseplate which is designed for the ronin gimbal but is small and super lightweight arca swiss, and most importantly has some M4 screw holes we can use to mount the 15mm rod clamp using some M4 screws instead of the normal 1/4 20s. This clamp is not the one I used as I already had one, and may actually be better as I had to use some washers to make my mount more secure. It's also not available on Amazon for some reason, so I'm a liar now I guess LOL.
So combined with all three of these and some 15mm rods, you have a secure SUPER lightweight baseplate with a quickrelease. There's other parts for the vmount ,monitor, and side handle so let me know if interested in those.