Thanks a lot! very descriptive and useful!! work for me on iMac mid 2010, 21'5.

this part is not complicated if you understand at first how the lock works.. remove the lock is easy, reassemble the cable and connect it is very problematic because the space to work is very tiny, but if you are carefully, it should be not a problem . try to see some videos from youtube first!

this part is complicated because the wire is very delicate. when you try to extract it passing through the others elements this wire trap it very easily on the other elements of the logic board

I bought another caddy, not the one from the description. i had to extract the plastic adaptor from the optical drive and put in on the new caddy 12,7mm

This is the 12.7mm caddy.. but, the caddy 9.5 mm fit fine as well? or it doesn't fit on imac mid 2010