There are 3 little clippy brackets installed in the case lid of the Corona 4 that originally held little rubber bumpers that clamp onto the platen when the case is closed, and serve as part of securing the carriage while the machine is in the case. On El Diablo‘s case these bumpers were somewhat intact, but crumbly and hard. This is not quite as bad as having bare clips, especially if you have a fresh platen and want to avoid getting gouges in your fresh platen, but it needed addressing.
The rubber bumpers on the front of the case lid, which press down the front lip of the machine when the case is closed, are still pretty pliable. I’ll leave these be.
I broke out the old bumpers on the carriage hold-down clips, and replaced them with rubber tubing slices. Now the case clamps down softly on my fresh platen when the case is closed.
Some scenes from my last letter writing session. (: