it is clean and oiled, cyl stop spring is good, puting brass in doesn't help, however if on the chambers that don't lock up you pull the trigger and hold back the hammer so it does't fall fast the chambers will lock up the hand must get just a little extra nudge. on the ones that do lock up they lock up very well hardly any play. i checked and took the end play out of the cyl. which i thought would take care of this but didn't, I think it is the extractor rachet. it is not cut well, rather crude if i got another extractor how much trouble are they to fit? i thought if i beveled the edge of the cyl. stop i might get it to engage with out much trouble guess not John