Hello, all. I'm certainly not the first to notice but inexpensive rotary dial padlocks such as Master Lock's 1500 series or even ancient ones like Yale & Towne's 515 series are opened using R-L-R typically. They can also be opened L-R-L using an alternate combination. To get the alternate for the 1500 series, subtract 6 from the first number (add
40 if the result is negative), add 3 to the second number, and the third number stays the same. The neat thing is often the L-R-L sequence results in turning the dial through shorter arcs than R-L-R and faster unlocking. Sincerely,