Shawnb, not possible in my case because I modified the decorative terminal covers for a flush reinstallation atop the plexiglass bridge. If the socket heads protruded proud of the face of the bridge due to washers, I won't be able to use a thin 3M double stick tissue thickness material to adhere my RGB terminal covers to the bridge.
My concern has always been that I have the correct length of screws. I'm an architect (and teacher) and not an engineer. But, I know that developed thread lengths are important for achieving the proper strength on connections. Not enough threads in contact with each other can have bad results resulting in broken threads because too much force on too small of a surface area can do damage.. Too long of a thread and you can damage the item it's being screwed into. I did not want to use a critical connection element without the proper specs coming from the equipment manufacturer's engineering team. I'm fine with hacking things that are not structural to an issue. But, if I damage the cooler block threads, or can't get sufficient contact pressure to provide an adequate watertight bond, then I'll have to live with the consequences of that. I have enough trouble and complexities in my life to deal with and don't need to stack "Gee, is my waterblock going to leak?" issue atop everything else!
The original spec in the bridge installation manual called for a M4x28 DIN 7984 screw. Checking with some precision calipers, I can see that the average internal length of the hole through the plexiglass bridge is 22.23mm. The low socket head thickness on the screw is 2.87mm. SO, if a 28mm screw includes the head (which is an odd way to list it, but that appears to be the way EKWB does it, not by the actual thread length) then a M4x28 screw SHOULD give me 25.13mm of thread. The internal length for the threaded portion of the screw on the bridge is 22.23mm on my bridge. That would give an internal thread connection distance inside the waterblock of 25.13 - 22.23 = 2.9mm (assuming full contact between surfaces). So, let's just call it 3mm of thread contact. When I measure the depth of usable threads inside the waterblock, I get a minimum value of 5.76mm and a maximum of 6.41mm. So, that leaves 2.75mm of extra space to ensure that the screws don't damage the waterblock.
Here's the odd part for me though. I received notice from EKWB that the screws they are now sending me are M4x27....that means I'll only get 2mm of threaded contact between the screws and the tapped holes in the waterblock. I hope 2mm of contact inside the Vector holes will be enough!
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