The most difficult part of the exercise is getting the mainspring back on the strut. Someone may know a trick for this but I eventually had to place two 1/4 inch thick aluminum plates in a vise and use my gut to push the strut between the plates enough to allow a nail to be inserted into the spring retention hole barely sticking out the back of the plates

After reassembling I could tell by the sound that there was a difference in the forward hammer force. I have shot 100 rounds without  a misfire and the primer indentations look more normal.  It is said CCI primers have the hardest cups so I tested  with CCI 200s, without cleaning primer pockets,  and priming using my press rather than a handheld tool where you can feel  the seating depth. This should be worse case scenario which is what I wanted to test.

Hope pulling together and detailing the process will help others that may run into Winchester rebound hammer misfires to implement this relatively simple fix and not resort to the other more radical and potentially dangerous alternatives out there. I just needed to finally sit down and attempt it and I'm not what I would consider mechanically inclined.  All that is needed is two proper sized screwdrivers, a caliper, stone or fine file, and some time and patience.