Welcome to the Quilting Board!
If the cap doesn't come off fairly easily with the flat screwdriver, I would keep it taped or pin point glue untill the brushes wear out which is hopefully a long time off. You can fool with it then.
Now that everyone is back in the shop, I'll ask my question again....does anyone know the measurements for a 3/4 machine? That little New Glenwood I just got seems small to me, but I don't know what size is considered 3/4. Anyone who hasn't seen the picture, go look in th Pictures thread. She's a real beauty....those decals are in great condition, and they just glow!!