Jim,
Depending on which version of the Mk-X you have, you may find the original trigger is fine. I have several, one of which is a custom made back in 1991 by Frank Wells of Tucson. Frank just used the original Mk-X adjustable trigger, and it breaks just fine. The only triggers I have replaced on Mk-Xs are the non-adjustable ones on the very early versions.
Cheers,
Rex
