I need my cad parts to be testes for strength of the magets and pull force

I am looking for a freelancer who can test the strength of magnets and the max pull force for my CAD's structural components. The ideal candidate should have experience in conducting pull and shear tests with a tolerable level of accuracy. The testing will involve assessing the strength of the magnets and the structures ability to withstand pulling and shearing forces. the magnets just stop the parts from rotating. Once you swist the parts and overcome the magnet force you can pull the "key" out formt he cylinder. It is a dog leash that uses magnets to hold it together. the magnets themselves do not hold it together but rather make it easier 2 connect the 2 parts. what holdes it together is the bumbs on the key that rest under the cylinder. I mostly want to make sure it is strong enough to not break when a dog is pulling on it. I would like it to support up to a german sheperds pulling stength. I also want to make sure that it is a fully working parts and that it will come together nicely. Iastly I need a description of a good type of material to use and manufactering process for xometry.com that way after I am have it made.