Re: 1st post...want to know more of this
Well, what you can build will be limited by the tools you have access to.
Most (all?) of the commercial designs are made with a milling machine and some of the guys here have access to one in some fashion...
That said you can make a simple block with just a drill press (Search #rotor block).
If you do end up making your own -- and it will be a great learning experience -- be prepared that your block may not perform as well as what's available for purchase. If that prospect upsets you you're best off buying a commercial water block -- you can have it running within the week! (do take care to leak test however)
Cheers
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