OK, so I adjusted my Sendero's trigger exactly as per these instructions (which match other ones I've found):
Remington Trigger Adjustments
Unfortunately, it did not work. After adjusting it (which seemed to work well) it now releases/fires every time I close the bolt. The only way I can keep it from doing this is by engaging the safety, and then whenever I disengage the safety, the pins still drops. I've tried moving each of the 3 screws independently, together, you name it and nothing changes it. It seems like something inside the trigger is in the wrong position, as I can hear a small "rattle" now inside the trigger that was not there before. What could have fallen out of place?
If anyone has suggestions (other than replacing with a Timney - I'd like to see if this one will work first) I'd appreciate them.
Oh, and I've worked on triggers on several of my rifles and shotguns previously, having taken them apart and adjusted them. So, I'm not really a newbie at it. If I can disassemble and reassemble my Ruger Mk II pistol, much less a Quadrajet, I should be able to do this.