My 510 is not broken, and even though as you adjust it, the pin becomes very wobbly, it has been fine for me, thus far. I just don't like fooling with the contact pin when I change/take off my atty, which I do a lot. I like different atty's, and while most of the ones I have do not require adjusting, some do, and as I purchase new atty's who knows if I will have to adjust them or not. I would rather not fool with it, and a spring loaded 510 would be the solution to the issue.
And no, I do not see the problem, as I could give it a shot, and break it!!! I want someone with the skillset to swap it without breaking it. You obviously made the incorrect assumption my 510 pin is broke, and if it was, and that was the actual issue, I would just send it in for repair, and purchase something else to tide me over until the repairs were completed.