u/Fun_Mortgage_6293

hello! I recently customised my first blythe. her eye mechanism works, but on the last pair of eyes it always gets stuck and doesnt work no matter how hard I pull the strings. all of my eye chips are the same thickness, and the other ones switch perfectly. its just the last pair that it gets stuck on, and then I have to manually turn the eyes back up to get any other colour. what could be the reason for this? none of the parts are loose and everything is in place- her eyes just wont "reset" after I reach the last set of eye chips. I used the two pull-string method, so she does not have a spring, but I figure this probably isnt the issue as ive seen people who did the same not have this issue.