Super tight press fit caps to put on the end of the pins that hold up the work surface of the 20 Ton (maybe others) Shop Press from Harbor Freight. With these attached you can rest assured the pins cant slide all the way through the holes. The rear one thats slotted makes it easier to slide on and off when adjusting the pins so the fronts can stay on indefinitely.

I printed these in PLA but will probably do a set in PETG or TPU since my garage can get kinda hot in the summer.