If I had no other choice. One could use the hinge pin and push threw some paper towels or cotton balls. With some alcohol. Many different was to clean the a arm hinge holes. Just got to find a small enough object to fit.
That's a mouth full🤣🤣🤣🤣🤣 and very precise🤣🤣🤣 at least we know it's 3.5...
As regards to Q-tip. Did you try and pull some of the cotton off to make it smaller. Yes the fcotton ball is to big to fit your correct. Doesn't mean he can't pull some off to make it fit. The little stick can be bigger then 3mm
Can also use a q-tip. With alcohol. Or can use tiny precision 3mm files
Like these or different types
https://www.amazon.com/dp/B07D12D36D/ref=cm_sw_r_cp_apa_glt_fabc_RM6YB1Z6R4D2TMKJQ875