I made a set a while ago (similar to #2) from black rubber washers that I found at Home Depot, and some paracord. The washers are beveled on one side so that you can slide them down the cord with gloves on.
I have yet to try them out simply because I never went out and marked out a known distance on the ground to count my standard pace to.
I did make some notes from articles that I found on the internet. They may be helpful to you:
4 Upper beads = 1 mile (1/10 mile) or 1 kilometer (1000 meters)
9 Lower Beads = 1/10 mile or 1/10 kilometer (100 meters
Zero your car odometer by a landmark and drive until your odometer hits .1 mile. Walk this distance a number of times counting how many times the same foot hits the street. Average the results. This is your base pace count.
Making allowance for changing conditions: On rough terrain, slope (up or down), thick brush, low light, add 20% for each condition that might cause you to change your stride.
Example: You’re walking to your next point and have a normal pace of 100 for 1/10th of a mile. You need to climb a section of hill for the next 1/10th of a mile, so for that section, your pace for the next section will be 120 paces per 1/10th of a mile instead of 100. If you were doing the same thing in the dark it would be 140 paces because you are applying the 20% for two different factors. Assume at least a 10 percent error rate on flat open terrain.
Hope this helps!