Actually, they aren't supposed to spin in both directions. If they do someone has removed the spring loaded detent in the ratchet window. Are you talking one gun doesn't rotate as smoothly backwards or when it is spun in the proper direction? You can probably get a Ron Power reverse pawl as the Ruger is basically the same design. What Ruger did was try to fix a problem with the original Vaquero. On that gun when you were loading or unloading and trying to line up the chamber with the loading gate if you went just a tad to far clockwise the pawl would slip to the next tooth on the ratchet and you would have to go all the way around to load or unload that chamber. On a Colt type action when you rotate the cylinder the hand (Ruger calls it a pawl) locks the cylinder in the proper location for loading/unloading. Ruger put a reverse spin pawl in the New Vaquero BUT then also put in a tiny spring loaded plunger in the ratchet window so the cylinder would only back up enough to perfectly align the chamber with the loading gate. Ruger did not intend for it to be totally free spinning in reverse. If you remove your cylinders and look at the part of the frame where the ratchet goes you can see this plunger or the hole where it was located. You may not even need a new pawl. If the plunger has been removed you need the plunger, spring, and retention screw. Since Ruger did not intend for the cylinder to free wheel in reverse, some of the guns may be rough going backwards with the plunger removed because the pawl is dragging slightly on the ratchet teeth. This is not a problem because, once again, Ruger did not intend for the cylinder to be free wheeling in reverse. If you remove the plunger and want the gun to go in reverse then sometimes the pawl needs a little more adjusting. This would also be true of any new pawl you were to obtain. It might not rotate in reverse at all until it is fitted to the gun.