I might be wrong but I learned some things from this thread's experts. If you cock a colt the slot on cylinder shoud be dead even w/ the slot on you recoil. Not loaded, cock the gun and drop the loading lever. It should fall right into the underneath chamber at 6 o'clock. Cock it again and see if it falls right. Actually it should go into 4 cocks before firing if you have it in perfect operating condition.
Is that right? Also, if cylinder is not rotating into position it could be a poor fitting of the hammer hand or wearing of its spring. Is that right?. Taylors and co has a good gunsmith if you don't know one.