Had my Uberti lock up on me today. Was in a "trigger flinch" exercise in which i put one round in the cylinder,then spun the cylinder so that I did not know which chamber held the round. Cock hammer, pull trigger, repeat until it went bang. Went fine for 4 cycles of this, then I had it lock up. Hammer was not fully cocked, trigger would not release hammer. Hammer could not be pulled back further to take tension off of trigger to allow for lowering of hammer. No slack in trigger to allow for lowering of hammer. Had to remove cylinder to extract the round, which would have rotated into firing position on next cocking cycle if hammer/trigger had not locked up. Removed round from cylinder, re-installed cylinder. No change. Trigger and hammer still locked in same position. Am suspecting trigger spring/sear relationship is amiss. What say ye? What am I looking for, what am I likely to find, and what is a reliable solution? Is this a common experience with Ubertis? I've had this one for over 20 years, and probly put fewer than 500 rounds through it.