Once you've learned how to work with the mainspring assembly, it's not that bad getting the sear leg lined up properly. I always keep a wooden block and hammer around for working on guns, and I use that if necessary to reseat the vertical strut after takedown (or knock it loose to begin with). Those are easier to keep track of than an Allen wrench, and there are no screws to strip. When you don't remove the mainspring housing, there's also the very real risk that you'll pull the trigger with the bolt out and cause you to have to manually reset it and realign the hammer leg while doing so.