Hello! I’ve been trying to identify what this part is that fell off the press and find the home to reinstall it on the press. It was found on the right side of the press when looking up towards the feedboard side.
I have a Vandercook No.4. Any direction you could provide would be great, thank you. 
Ok, I think I got this time: It’s the MS-153 Stop plate under the frear trip wedge. Sheet also manual Sheet 107.
Initially I thought it was this piece too but then I checked and we have all four still on and it appears that the piece that fell off is not as wide as the bumper plate.
This is one of four MS-122 bumper plates. Sheet also manual Sheet 106.