I recently purchased a modern model f and was inspired to obtain an original one for comparison. Got a pretty good deal on craigslist ($40) and opened to clean the whole thing.
Now... I'm having problem sliding the pcb/backplate back into the top plate.



Maybe it's because of a lack of muscle, maybe it's because I don't have any clamp I can use, but it never seems so difficult in all the guides I found. Does anyone have a tip of how it can be done? Knowing that I may have to open them a few times to adjust the spacebar, I want to know what is the best way to put the plates together.
Thanks!!