It's unreal the amount of thread that can collect under there. I didn't take a photo of Eliza's (the 222) thread jam or the poor painter FW I picked up. It wasn't so "spiky", but possibly more thread was wrapped under there, but here's the 301 that I picked up this summer:
[ATTACH=CONFIG]438581[/ATTACH]
[ATTACH=CONFIG]438583[/ATTACH]
[ATTACH=CONFIG]438585[/ATTACH]
Which is probably why there are instructions in the owner's manual for taking this part of the machine apart. Possibly the only real flaw of the FW and 301. Even just not holding the tails when you start to sew will cause this.