i think the nut i used was from a front strut aka 22mm one to remove to get the cup off the top.. but been a while..
i tiged black seam free gas pipe... hardware store less then buck.. and welded to nut that fits slide hammer.. you could use a bolt if need be with nut thru say a hub adapter fixture.. be a little offset.. but works...
also if you make said tool... lok at #1 and #2.. make sure it can clear the fuel pump.. too short.. with hub adapter.. clearance issue... the 10lb slide hammer i was using i had to do it that way as that slide hammer over 1/2" in diameter on the tube alone...
that 15+ min was horrific... i worked tooooooo hard