I start by removing the rear trigger and spring completely, then set up the front trigger like any other single trigger, ie, able to bring the cock back all the way into the sear with no interference and very little free play. Then, reassemble the rear trigger and spring. The thing to remember is that the rear trigger should trip the sear from the momentum of the trigger spring moving it upward and be able to return slightly to the rest position. You can use the front trigger as a guide here but at this point, leave a little extra metal on the rear trigger. I put a little bit of Prussian blue on the sear so I can see exactly where the trigger bar is striking the sear.There is no getting around the fact that from here on out, it is a cut and fit operation and will require some patience. With the triggers unset, pull the cock back to full cock. It probably won't go to full cock because the tension of the rear trigger spring is preventing it. Disassemble the trigger assembly and note where the blue mark is, then remove a SLIGHT amount of metal from the point. Reassemble and repeat. As you get closer you will find it wants to come to full cock but just won't hold it. That is where you really need to take it easy and remove very little metal. It is a fiddly operation but pretty straight forward. Once you have done a few, it is actually fairly easy. But, if this is your first one, take it slow, it is easier to take off just a bit more metal than add any more back on! Some set triggers have an adjustment screw so you can adjust the front trigger slightly as well. That is also a matter of making small adjustments. Hope this helped, good luck.
