Skinny Joe,
I believe you're describing a Ruger DA and when you said 'cylinder out' you meant the cylinder was rotated out on the cylinder 'crane' from its closed position...?
If so, the rear pin you describe is a spring loaded device that secures the rear of the cylinder when closed. It is free to 'wobble' a bit but does not wobble when the cylinder is closed.
The front cylinder 'axle' for want of a better word is an ingenious design improvement by Ruger. With Smiths and Colts, the cylinder 'axle' is a critical part. The tip of it is the only lockup for the front of the cylinder and the slightest kink or bend in it can put those revolvers out of action.
Not so with a Ruger, where it is merely a 'push rod' for the star extractor. In a Ruger, the real lock up for the front of the cylinder is a sort of door latch, a spring loaded mini 'door bolt' right where the cylinder 'crane' swings into the frame. This is much stronger than most other double action revolvers and firmly locks up the front of the cylinder without depending on the axle.
You might also notice that the recesses or notches for the bolt lockup near each cylinder chamber are offset in Rugers so as to not compromise the thickness of the chamber walls at that point. Smiths and Colts, however, have their notches cut directly in line with the chambers which could weaken them. I have never personally seen this happen but it is a possibility I always have in mind when I cook up fairly warm hand loads for my Rugers---loads I will not fire in my Smiths or Colts but have no qualms at all with them in my Rugers.
I do love my Rugers and I have a bunch of them. However, please note that my absolute, number ONE revolver and handgun, my pride and joy, is my S&W 41 mag with six inch barrel. I carry this gem on and off duty, hunt deer and elk with it, and I guess, if it was still possible to have sex at my age, I'd probably sleep with it....! Just kidding but not all that much. An old soldier and gunsmith shouldn't fall in love with any gun but I do love my Smith 41 and I wish to hell Ruger would again make their Redhawk in 41 mag, I'd buy several.....
BTW, a test of proper revolver lockup is to fully pull the trigger and keep it pulled (OF COURSE WITH AN EMPTY GUN) while easing the hammer down part way. When you do this, the cylinder bolt, which projects up from the inside bottom of the frame, should push a bit farther up to lock the cylinder more firmly in place during firing. With the hammer down and trigger not pulled, most revolvers will have some cylinder free play.
Hope I answered your question without boring you to tears......?