Wiper holder replacement

Hi. Can anyone help? Need to replace the wiper holder on our VP-540. Trying to remove the mechanism - can get the front (motor end) free, but there appears to be a screw holding the back end - you can just see the thread, meaning it's screwed in from the other side. How do I get to it? I can't see a way without major disassembly - could really do with some words of wisdom!

TIA

 

Still trying with this. Anyone know how to take off what is called the rear Apron on the Versacamm - it's the stainless piece that runs the width of the machine at the rear, where the material runs over it to the pinch rollers. According to the notes, it's just four screws along the bottom edge, which I've removed, but it still won't budge. Any ideas?
TIA