A hitch in my giddy up.

[Big guy]

I have experience gunsmithing SxS shotguns but I am new to revolvers. I wanted a J frame 32H&R and read that the 32 S&W long could be reamer to H&R. I did not want to modify one of my existing guns so I obtained a used cylinder and reamed to H&R. swapped cylinders and all is well except when firing double action there’s a little hitch just before the hammer drops. What do I need to address to rectify this?

 

[-BTM-]

Double action but not single action, or both? Hand/ratchet fit maybe?

 

[Big guy]

Only noticed with double action.