I’m teaching a workshop at Northern Kentucky University where they have an SP-15. It’s been many years since I have used this press. We’re having a problem with the tympan paper coming undone at the back. The ratchet that holds the tightening bar in place appears to me to be set backwards, at least it is on backwards compared to my #4. The end that grabs the ridges points downward away from the operator, and this makes it very hard to control. The school doesn’t have a manual, apparently, so I need some advice. If it’s backward, I’d like to set up right side up so that it would be easier to use. I shot some photos but my hosts don’t have any way for me to upload the photos from my camera. Any thoughts? Thanks!