I have a master #175, actually i didn't even try playing with it till i saw this thread yesterday, so last knight i looked at the lock for a while, knowing how it works, i used a flash light and literally lined up the flat spots inside the lock, no shims, no feeler gages, just a flash light at a right angle, and a little pressure on the dial to push it as far left as the slot allows you to and the lock will reveal you its secrets
Once you find the flat spot, note the digit it corresponds to, your combination digit is 2 digits below, so like if the flat spot is at 8, then your combination digit is 6, 1 is a 9, and so forth.
But yes, if you have the sesame feeler, knowing where to insert it, you can definitely find the flat spots, i tested it yesterday, works. Oh hint on those heights, take a marker and make a line on the feeler to have a reference point.
Let the picking begin...