Custom letter rings for Master Lock "Set Your Own" word combination
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Custom rings for Master Lock with letter distribution that is far more statistically useful than the stock assortment.
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- Puzzles & Brain-teasers
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- Creative Commons — Attribution
BLUF: Make literally any five character combo you want on a MasterLock
My brother and I design and build escape rooms that we subsequently inflict on our friends and family. We were immediately therefore intrigued by a combination lock that not only lets you change the combo, but even lets you swap the rings' order as you see fit to create whatever combination you like.
Specifically: these Master Locks available on Amazon
The problem is the stock letter distribution is pretty abysmal. The first ring has the first ten letters of the alphabet; the second lettered ring (which you get two of) has the next ten letters; and the last ring has the last six and some punctuation marks. You're also given four rings of 0-9.
The quantity of words you can make is… not great.
I reverse engineered the provided rings to make use of the existing mechanisms, allowing me to place whatever letters I wanted onto the ten positions of each ring.
I then did some statistical analysis of all 4 and 5 letter words in English, considering usage of each letter in each position, and came up with these rings, which provide a darned near optimal distribution. (Ranks 10 and 11 for position 1 were pretty close, but I let rank 11 (which was ‘H’) win, because I wanted an H in position 1; I also left exclamation mark and question mark on ring 5 because of reasons).
Also note: I made no attempt to sanitize against “bad words”; I was going solely for maximum statistical distribution and total word count, so you will likely be able to form many “offensive” words.
Mind you, I did not bother to copy MasterLock's technique for interlocking their rings (a small portion juts out to compel you to orient them the right way), and consequently the 5th ring is slightly narrower than the other four, so the lock's end cap has sufficient space to slide back on all the way.
The filenames of the rings tell you which position they're meant to go in and which letters are present on the ring (with lowercase x and q on ring 5 denoting eXclamation and Question marks, respectively).
I've also attached the FreeCAD project I did it all in, if you wish to customize yet further.