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Toss a med ball on the assisted dip/chin machine.
Position yourself to do tricep extensions to forehead and superset this with close grip presses.
If needed you can position the ball on a flat bench and perform in a angled push-up position and use your bodyweight as resistance.
There are many variations to do this superset but the take away is its joint friendly and is not that eccentric demanding, so it can be used with very high volume, as well as for extra-workouts if recovery is needed.
The reason for the ball is to try to spread it apart creating more tension on the triceps.