Here is a copy of what I posted on another site. Normal caveats apply.
"If you take your contender trigger assy out of the firearm (it's understood, gun unloaded, grip off, etc etc) you can play with it for just a coupe of minutes and see that is it a relatively simple design. You can cock the striker and engage the sear. You can pull the trigger and watch it release. da da da.....
Ok, notice the trigger itself is held in place with a single pin. There is a tang, below the sear engagement, that is holding a small metal cup and the trigger return spring in place. (Play with it, watch it work.) You can drive out that pin and let your punch or whatever you are using, hold the trigger in place. Now CAREFULLY, VERY CAREFULLY, withdraw your punch while holding the trigger in place with your fingers. You want to slowly slide that trigger toward the rear of the housing, but you want a couple of your fingers above that tang to hold that metal cup and spring to keep them from flying out. THEY WILL FLY and lose themselves in your carpet if you are not careful. If you are doing this in your reloading room like I do, likely that metal cup will fall into the plethora of spent primers littering your floor. Fun search now.
Ok, you have it apart. This little spring is the one you remove coils to lighten the trigger pull. Like Smokin' said, cut off about a 1/4 coil at a time. If you have one of the newer stiffer springs, maybe even an 1/8 of a coil.
Carefully put the spring and metal cap back in the housing and put your punch in the pin hole to retain the trigger. If you have the right size punch, it will work as a temporary pin so you can try the trigger a few times. So try it! How is it? Does it return properly? Maybe you need to disassemble and take off another 1/8 or 1/4 of a coil. Try again. And again if you must, until that trigger pull is getting to your liking. If you cut too much off, the trigger will not return and your sear will not engage.
Once you get the spring short enough to lighten the pull, but still long enough to return the trigger, reassmble by driving the trigger retaining pin back in with a brass hammer. Put the trigger assy back in the gun and try it again. You can adjust it a little more by using the sear engagement screw.
Good luck and let us know how it turns out. If you lose the spring and metal cup in the carpet or within the primers all over your floor, let us know. Someone is sure to have extra parts at home from having lost their own sometime in the past."
Give it a try. Hope this helps.
Steve