What is the purpose of the small narrow piece of tape that sits beneath the diodes on a flipper coil?

To provide context, I'm working on my first restoration (HS2) and noticed when cleaning all of the flipper coils that this piece of tape is very dirty, and lifting. I'd like to clean this up or replace it if required/possible so that it is clean like everything else.

However, I'm having trouble understanding what its purpose is. On all of the coils I've looked at, the leg with both thick and thin windings, and also the leg with just the thick winding are covered by the tape. The leg with just the thin winding is above the tape. Is it to protect from an accidental short, or heat, or something else altogether?

Thanks for the replies. I hadn't considered the manufacturing angle, but it makes sense. I suppose the main area at risk is the thick winding where it exits towards the centre leg. It'd be possible for the insulation to be damaged while the thin wire is wound, causing a short.

I've attached a photo just in case anyone stumbles across this thread and isn't sure what I was referring to.

Would you just peel it off and throw it away in this case (and verify there is no short before reinstalling the coil)? Or would you try to slide some new tape in there? The third option is obviously to just leave it as is. Once I've cleaned everything else though, I don't think I could bring myself to do that!

IMG_2131 (resized).jpg

I haven't performed any soldering on this coil. One of the previous owners/operators certainly needs one though!