Picked up a used Uberti Bisley (SAA) .45 LC today. I'm having a devil of a time removing the cylinder - tried all of the combinations of 1/4 cock, half, full, loading gate open, closed. The base pin catch pushes in and cylinder spins freely, but the base pin itself will not slide out. Seems to me I remember when I had a Uberti Cattleman (basically the same gun) several years ago it was the same thing. I'm wondering if I'm missing a step. Any ideas?