One of the screws backed out of my powder drop linkage while I was using it yesterday. I ended up weighing every loaded round from that batch. Any suspect rounds that deviated too far from a known baseline were taken apart. All had powder; all were within +/-.1 grain. I'm now checking the screws each batch. If they get loose again, a dab of blue Lock-Tite 242 will be in order.
A can of R134a dry air is invaluable in keeping the press clean.
Verifying that the press is locked in position after indexing saves cases. I placed marks on the press as visual aids, but mostly a slight tug as I'm guiding the bullet into the seating die does the trick.