Can I get a replacement for the standard blade/razor?

My Norelco Multigroom still working great, but I have problem with the main, wide blades on this model.

The blade wont stay in it's location. Usually you'd insert and turn and the head is locked in. My blade doesn't "lock in" and when this is turned on, the blade eventually is shaken loose and then won't work.

The smaller blades stay locked in with no problem, so it appears the problem isn't the main section.

I've looked online but can't find anything about obtaining a new blade.