I found this $10 LED flashlight on amazon that is a perfect fit for the toolhead hole on my 550 - https://www.amazon.com/gp/product/B017R560WC/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
It isn't a snug enough fit to keep from falling all through, but just add a zip tie or some tape around the body and insert it. Runs on a single AAA battery. I have no idea how long the battery will last, but I've used mine for about 8 hours of reloading (not all at once), and it is still holding up.