I really liked the Old 45 too. Drilled the base for a cartridge heater running on 12V as I also use 12V LED's on my Presses so it fit into the same power jacks... I'll miss it, but already have a New 4500 mounted in it's place. Drilled & tapped the aluminum base plate for the 4500. Moved the 12V heaters to the base & not on the sizer itself
I will be making a new handle & keep the Old 45 setup with a different lube. Old 45 got the Oring upgrade too.
New 4500 is pretty nice. More open for the placement & removal of boolits & less effort to use. Had to wash out all the iron filings out of the new 4500 before I filled it with Carnuba Red. 45 came to me as a gift from a friends Father's reloading outfit. I need to fix it back up as it's still in great condition.