tipping the rack platform down towards the front makes the bag want to slide forward. If the tombstone is tilted back, the bag is less likely to ride up on the tombstone, it will tend to slide down if anything. I don't think it matters that much, but it's amazing how much a bump will make the bag want to fly.

I didn't use the lathe last time because I procrastinated before a ride, it was getting late, and I have 450 rack bosses in steel. Well, 449 now. And I always prefer if someone else taps something like that. I suppose it's similar to not wanting to see sausage being made