Be happy it was the replaceable/repairable screw. I have under my bench a 4500 where the previous owner busted out the bottom of the casting, the newer 4500's don't have the steel inset like the 450's and the casting seems to be real thin in this area. He must have had access to a machine shop as someone turned a new oversize bottom piece hold the T base of the pressure screw and cover the blown out casting. They then went one step further and machined out an aluminum plate to set on and screwed it all together. I wondered why it sold so cheap, but it was my second sizer at the time.
The whole thing is currently bolted down to a Lyman heater and filled with Speed Green. Of course the sizer casting base is nowhere near flat and the heated lube goes everywhere and leaks out the sides. when the lube runs out I will likely not put lube that requires heat back in this one and potentially
look for a more permanent solution that seals better. I called once to see about getting a replacement housing, but for the price Lyman wanted I could buy 3 or 4 replacement sizers on the secondary market.
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