The lifting plate has several screws that need to be removed. I think some of the screws can be removed with the treadle on on its back and can possibly remove the screws at the back of the plate that screw into the top while it is on its back. There are some images of the pieces that need to be removed at
https://www.etsy.com/listing/6362249...isting_details
Oh, have you seen
https://kathieskabin.blogspot.com/20...nome-712t.html ?