I seldom have problems assembling the sear in the trigger, but it happens occasionally. I don't use the trigger spring tool anymore either. After the trigger is in place, I start the pin, but not enough to block the sear from dropping in place. Drop in the sear spring and then drop in the sear. I then use the hammer to engage the end of the sear (just like it normally does in operation) and push the sear back into place enough so the trigger/sear pin will go through. I keep a finger over the top of the sear because it will pop out if you don't. Using the hammer to set the sear is essentially the same thing as inserting the hammer and pushing the hammer pin through. The sear has to be engaged by the hammer so the hammer pin will go in. Just in my usage I do it for the trigger/sear pin too.
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