I actually bought these ones:
https://www.ebay.com (commissions earned)
They seem to be better than the ones from JDToy because they are not at thick and don't rub on the sides when going in (or out).
I am pretty sure my original ones started to break because they were crap but they didn't fall off completely until I tried to pull it out it. As I was pulling it out it then got stuck on the sides and completely fell off.
https://www.ebay.com (commissions earned)
They seem to be better than the ones from JDToy because they are not at thick and don't rub on the sides when going in (or out).
I am pretty sure my original ones started to break because they were crap but they didn't fall off completely until I tried to pull it out it. As I was pulling it out it then got stuck on the sides and completely fell off.