Given the action has been trued up, putting 50 ft lbs of torque on it is a common amount.
If you aren’t going to wait, and we know you aren’t, 50 ft lbs is pretty easy to hold for. Take an 30” section of 2x6 Douglas fir board and use a hole saw to make a 1-1/4” cross hole 6” from one end for the barrel and a 7/16” hole on each side through the full 5-1/2” depth about 3/4” away from the big cross hole. Split length ways along the grain removing 1/4” of wood, use 3/8” allthread, long coupler nuts or grade 5 or 8 nuts, and big 1/4” thick washers from the electrical isle at Home Depot to clamp tight. Degrease and wrap barrel with drywall tape to protect the finish. Repeat for front of the action with a 1-3/8” hole. 50 ft lbs is the same as a downward pressure of 25 lbs on the 2’ lever you just made.
That will easily hold 50 ftlbs without slipping and scratching the finish, but only if it’s tightened securely and the hole is uniform. Having said that, 25% of people will get it right, 25% won’t tighten enough and it slips, 25% won’t take out the full 1/4” strip and it slips, and 25% will overtighten and strip the nuts.
With most things in life a 25% success rate is not great, so my ability to teach is greatly in doubt before you’ve even tried this, so it’s worth what you paid.
Avoid the temptation to use two strap wrenches from the plumbing isle - they may get you the torque, but they may leave marks because of the way a lot of rubbing pressure is placed on a small section of steel as it’s tightened and stretched. Having said that, many savage nuts have been torqued with those, but not by me.
