Little white plastic pin falls out of DCC900, Don't know where it must fit

When assembling after a long repair, a small white 13mm long, 5mm diameter pin falls out of my DCC900. I don’t know where it came off. So frustrating! My DCC works 100% perfectly recording and playback, so I guess it’s not a critical part. Anyone knows where I must fit it? Have seen this in a DCC900? Thanks in advance.

Hi and welcome,
It is for alignment of the mechanism and not a super vital part.
There are two of them next to the right screws that hold the entire mechanism.
They always fall out and can be put back easily.