This one has been drilled and the pivot pin moved. The second hole? That is so I can set them up at about 3.5 lbs for the kids. We did five this weekend and I don’t know how I may want to use them in the future, so I usually drill both holes while I have everything set up. This one is for a 580 series Remington. The 788 is the same. This one has a sear engagement inspection port, some do, some don’t. On most that don’t you can look in on the side the safety lever is mounted to and see it and scribe your line on that side. Either that or drill an inspection port.
Carbide drills are a must if you are moving the pivot point. You won’t touch the trigger with a HSS drill. All you will accomplish is to ruin the drill.
I use 6-48 screws instead of 6-32, probably because I have a bunch. They make the adjustment finer too.
If you are going to add a sear engagement/spring perch use a 10-32 for that. That sear spring is pretty tough and you need the stronger 10-32.