Weslock door knob - external knob comes off

Hello:

I have Weslock door knobs through out my house, both lockable and not.

The knob on my pantry door comes off when you pull on it. How can I repair this?

I can take off the internal knob by using a flat head screw driver on the tab, the knob pops off. I can then take the rose off, exposing the mounting plate and screws.

Except for these screws and the ones on face plate of the latch assembly, I don't see any other screws. Is there any way for me to repair the knob without replacing the whole door knob assembly?

Thanks.

Weslock door knob - external knob comes off