The mystery of the missing silicon plug has been solved.
Whatever cartridges are not currently in my printer are stored in a sealed plastic bag.
I found the errant plug in that bag.
That means that after I had replaced the C, PC, M, and PM refilled cartridges in the printer with OEM cartridges, it fell out (without spilling any ink).
Then when someone suggested I reverse the order, and begin putting refilled cartridges back in the printer, I put in the M and PM cartridges back in, minus the plug in the PM.
Since that time I have not printed any photos.
The emergency has ended - you may resume whatever you were doing when the alarm went off.
Dave S.
Whatever cartridges are not currently in my printer are stored in a sealed plastic bag.
I found the errant plug in that bag.
That means that after I had replaced the C, PC, M, and PM refilled cartridges in the printer with OEM cartridges, it fell out (without spilling any ink).
Then when someone suggested I reverse the order, and begin putting refilled cartridges back in the printer, I put in the M and PM cartridges back in, minus the plug in the PM.
Since that time I have not printed any photos.
The emergency has ended - you may resume whatever you were doing when the alarm went off.
Dave S.