Out friend Bill May sent me this back in June asking me not to post it, then a few weeks ago he said I could post it. He said he didn't have time. I'll try to follow up with the pictures he sent me. Sorry for the length but it is very clever.
Cut a piece of wire, one-tenth inch diameter, about three-sixteenths inch in length. I'm using a piece of brass rod stock. Push the opening lever all the way to the right. This will move the mainspring enough to get a medium sized screwdriver between the spring and the side of the action. Point the front of the action toward the floor, place the piece of wire into the narrow gap at the intersecting edge of the frame and the mainspring with the screwdriver blade inserted about one eighth below this junction. Pry the spring open until the piece if wire drops into the increasing gap (the screwdriver blade serves as a stop guide). Make sure there is adequate clearance at the bottom and back of the frame to allow proper repositioning of the stock. Reposition wire, if necessary and closely inspect it to make sure it's not too long. Release the top lever. The threaded top lever shaft will now float with plenty of room to easily reassemble and start the top lever retaining screw forward of the trigger.
To be able to get the wire jig out, you must cut a small crescent shaped notch into the thin band of wood on the right side of the very front of the inletting on the stock. Take a look at one of the pictures that has a broken out chunk for proper location. The correct position for this notch is at the widest point of the milled radius cut into the frame to accommodate the cocking cam. At this point, there is no bearing surface between wood and metal, so no structural integrity is compromised (or very little, if any). A dremel tool works best for this cut.
To reassemble, simply place the receiver into the stock, upside-down. Carefully realign the safety into the trigger group and wiggle the top lever enough to align the holes. Check safety and trigger function right now. Insert screws and semi-tighten. Turn action right-side-up, move top lever to open position, turn action onto right side, shake a little and the wire jig will drop out, right into your hand...
You're now ready to install lock plates and remainder of screws, etc. You can reassemble without a vise, no problem. I don't even lay it on a table. Just hold it in one hand and put the parts on with the other...