See if this works with your machine
Janome Short Handle Screwdriver is designed to remove the Needleplate easily when you want to gain access to broken needles, threads, feeddogs, bobbin case and to clean out the lint from your machine.
The wings on the handle give extra grip and leverage for ease of use, and the short handle fits neatly under the head of your machine for quick accurate access to remove the needleplate.
Part Number: 820832005
Guaranteed to fit because it is a part.