Regarding the spool pin, make sure it's the right type. I ordered new spool pin three times before I got the right one. Two sellers insisited it was the right kind, I didin't know any better because it was my first machine and until I got the right one I didn't have any good point of referance. It should tap in place easily, I 66 have tap in spool pins, some models vary this way and can have screw in spool pins.
The type of lamp with the thick glass lens is the only one I have problem with overheating. I suspect it was a common problem, but I also suspect we had better 15W bulbs before (productions varied then too). I found a LED type bulb for mine, it's much cooler, lots more light, and I can keep the lense on.