Please excuse my preaching to the choir, but something may be helpful to others.
I got a wild hair a year or so ago (yes, another one) and went on an Albrecht jag. I have long owned and used all of them, up to and including 1/2" capacity. I had a yearning for a 5/8" capacity. I bought used and distressed (pretty cheap) from eBay, based mostly on my intuition (guess) of reparability. I ended up with more than 6 good chucks (including a couple 1/2"). It was a substantial project and a learning experience. I also ended up with one 5/8 chuck assembled almost entirely of unserviceable (serious understatement) parts collected from rebuilds.
My advise is put ROLM on your keyless chuck search list. I got a couple of those (1/2") too. The ROLM are not as completely rebuildable, as the Albrecht are, but major rebuilds (OEM parts cost) are too expensive for either brand. Both of my ROLMs only needed a good cleaning to be fully serviceable.
After my rebuilding experience, I think highly of the Albrecht chucks, but will not be needing additional (I've plucked that wild hair).
I suggest, if one is looking for a used and fully serviceable Albrecht chuck, one needs to touch it before buying. Even take along a drill blank, DTI and mag mount. Spin the chuck and check runout. Open and close the chuck to verify full range, smooth operation. If both are satisfactory, as well as the price, buy it and do as you will with it. I also suggest that just spraying the guts with brake parts cleaner is not a right. An Albrecht needs to be fully disassembled and cleaned. The devil is in the details. Burrs may need to be dressed away. Almost everything needs limited, but proper lubrication. OX tool has a good video on Youtube, except he lubed the spindle threads, which Albrecht says shall not be lubricated. YMMV
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