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Response Part I. How the Colt I & D Frame works:
In the Double Action mode, as the trigger is pulled rearward, the hand is raised. The finger of the rebound lever rests on the pivot pin of the hand. So, as the hand rises and engages the ratchet of the cylinder, it carries the rebound lever upward and causes the tail of the bolt to pivot upwards. Resultingly, the bolt drops, disengaging it from the cylinder and allows the cylinder to be rotated by the hand. Concurrently, the safety lever is raised (by the trigger) causing the safety to slide downwards. The trigger nose now begins to engage the sear, allowing the hammer to start its rearward motion. When the hand rotates the the cylinder 1/2 to 2/3 of the point of indexing the next chamber, the bolt tail falls off the rebound lever shelf. The bolt is then forced upwards by the bolt spring, resulting in the bolt engaging the leading notch of the cylinder. The cylinder is then arrested from further rotation by the bolt which engages the cylinder notch. The trigger nose continues to raise the sear. When this happens, the hammer is forced forward by the pressure acting upon it from the rebound lever. The mainspring supplies the pressure for the rebound lever. The hammer falls on the frame mounted and spring loaded firing pin, which strikes the primer; thereby compressing the anvil in the primer. The crushing of the anvil grinds the primer compound to 300 degrees, thereby causing ignition. The flash travels through the primer hole into the chamber of the case, igniting the propellant. The gases formed by the propellant dislodges the bullet from the case. The bullet then begins its journey which will take it from the cylinder, past the barrel cylinder gap, through the forcing cone, down the barrel and eventually out of the muzzle.
As the trigger is released, the hand begins to lower and disengages itself from the cylinder ratchet. This permits the rebound lever finger to follow the hand downwards. As the rebound lever lowers, the shelf of the rebound lever forces the bolt tail raised. The trigger nose pushes the sear inward (towards the hammer) and an audible click can be hard as the trigger disengages the sear and allows the sear to return to its position of rest. The safety lever is lowered, allowing the safety to rise. The hammer is pulled away from the firing pin by the mainspring. The bolt tail now pops back onto the shelf of the rebound lever and another audible click is heard. The trigger is now returned to its position of rest by pressure from the finger of the rebound lever. The hammer returns to its position of rest by both the mainspring and a camming action from the rebound lever against the seat of the hammer.
When I return with Part II, I'll discuss timing the bolt. PS, it could also be your hand prematurely engaging the cylinder ratchet.
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