For those of you that would like to light up the inside of your 550B so you can see whats going on, especially the powder charge, i have found the perfect light. I contacted Inline Fabrications, who make Egro handles and other accessories for Dillon Presses. They also have LED strip lights for various presses. I sent an email asking if the strip lights would fit the 550. They have a new one out that isn't on their site yet. It fits into the center hole of the tool head. It has an on off switch and let me tell you, it REALLY lights up the inside of the press well. You could turn off all other lights in the room and still see and reload. No trouble seeing the powder in your case. It's one of the best add-ons i have for my press. If your interested, send them an email or call. It's a well thought out design. Check it out !!