Before you give up on purchasing used H.E. Harris Citation albums on
ebay, let me share my story.
I started with a Statesman album in the early 70's, and upgraded to the 2 Volume Standard albums (the step up from the Citation, and the best albums that H.E. Harris had sold) in the late 70's. Both the Statesman (which I still have for my UN and US stamps) and Standard albums use the "screw" post that you mentioned. I've kept up with the annual worldwide supplements but obviously have needed additional binders. I purchased the Harris Worldwide Heirloom binders that you also noted (six of them).
Every so often, I'll search on
ebay for used Standard albums or collections, and I've purchased two of them over the last couple of years. The first set of Standard albums came with the screw posts, so no problem there. However, the last set of Standard albums I purchased about a month ago came with the "rod through post" mechanism. I could tell these Standard albums were from the late 60's though, which were manufactured earlier than my Standard albums purchased in the late 70's and the other set I purchased on
ebay.
Therefore, it may simply be a matter of when the Harris albums were manufactured. So if you look on
ebay, check the description photos closely or ask the seller. That's what I plan to do in the future.
As a side note, I like buying them on
ebay as I get the binders I need plus a bunch of stamps to sort through. As an added bonus, I've found that I get some nice replacement pages for my 70's era Harris album (ie. more stamp illustrations from the 60's, 50's, and possibly earlier).
Rick