Welcome me to the my PERS is broken club. Yes, the PERS on my DX Joker is broken, and this is the second time. It first broke the second day I got it last year. The local distributor was kind enough to send it back to HT for me but the replacement took months.
Now the PERS is broken again and this is like only the fifth time I have been adjusting the eyes.
Knowing that there is no way HT will replace them again for me, I decided to take it apart to see if I can fix it and fix it I did. But this is not a permanent fix. Due to a mold flaw, this will only break again one day. They molded the slot for the eyes a little to small for the Joker. Hence the very unsmooth movement.
Repeated movement causes stress to the system and the hinges will crack and broke. On mine, one broke and another already cracked.
Next time it breaks again, I am just doing to convert it to like ETB eyes. Letting move individually. Seems easy enough with the right tools.