The lens hacking series of posts continue here at my Blog!~ Further to the last one for how a Chinese Pentaxian and hacker converted his Rikenon P50/1.7 prime into a "Pentax-A" one, I think we need to read also this very useful tutorial for what a Vietnamese Pentaxian and hacker posted at the PF previously (in English):-
http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/63878-how-convert-k-m-lens-ka-lens.html
Oh, that's really great and brilliant! (My Thumb Up~!)
As for the "01" coding, you can read what all you need to know here at the K-mount page.
Anyway, I do have some doubt about the time-longevity of the corrector's paint for used as the insulating material, which should be worn out after a certain period of time. So, the working principle and trick are there. You should find your own ways to improve and get the job done! My pre-Congratz to you for being a successful camera gear hacker, particularly in the Pentaxland! ;-D
N.B. I would prefer to use mini dot-shape stickers btw.
Related:-
Converting K-M (K-M means Konica-Minolta this time! ;->) Lenses into Pentax K-mount Ones!
Modding a Rikenon-P 50/1.7 Into an "A" Lens! :-o
Disassemble the Pentax-F 70-210 Zoom Lens
Disassemble the Old Takumar-F 28-80 Zoom Lens
Disassemble (and Repair) a DA* 50-135!
Repair a Stuck SDM Yourself!
Disassemble a DAL 18-55