So my printer's been very very idle for the last few weeks. I was having difficulty with the filament not feeding consistently. After further investigation with some help from felix, I discovered that it was most likely due to a fairly significant break in part of the extruder frame. It's the bit where the spring/screw goes through to the extruder arm to tighten up the grip on the filament: (I put a piece of paper behind it so it's a bit clearer)

I've contacted felix about this, and although he has been a big help in trying to get this sorted, I think he's unavailable at the moment. After looking at this crack/break, I noticed that if the crack was just repaired, it can hold a tight enough grip on the bolt that I might just get away with printing a replacement part myself. The plan is to use a particularly strong glue that I occasionally use for some architecture work. I can then hold it in place with a small clamp while it dries (I'll give it a good few hours) and then reprint the extruder arm (hoepfuly.) The thing is, I need it VERY urgently, as I've university finals at the start of September. So, I've three questions to see if anyone can shed some light on things:
1. Any suggestions/tips on how I could repair this part?
2. Any alternative solutions to how I could put a consistently tight grip on the fillament given my current situation?
3. Recommended print settings should I get this up and running?
Any help would be amazing!