i'll get a picture when i can (my shop is not at home), but it doesn't look like that (paul). it has two screw holes, and slips over the frame, in the hole where the coils go. okay, stupid of me to post a question with no picture....i'll get back.
TT, now that i look at the diagram you posted, it is indeed part #17 in that diagram. is that the "protector" you are talking about?