Here is a little tip some of you may find helpful. Go to sears and get your self a 12 point, 12 x 13 metric, flat ratchet wrench. On the lubricator's feed screw file a very slight taper from the turrning rod to the top of the feed screw. Using the 12 mm wrench, center it on the top and tap lightly with a hammer.
The hardened steel of the wrench will engrave into the softer feed screw. Now you have a ratchet type handle like on a Lyman. Make sure you have the wrench set for counter clockwize as it can be hard to remove the first couple of times.
I have found this to cut down on the time I spend sizing by not having to switch hands to turn the feed screw. It's always in to position that works best for you.