Chinook 30: Bypass plate scraping?

[Tron]

During another bird rescue this morning I noticed that the bypass plate, which normally clicks nicely into place when closing, seems to scrape on something on the last inch of closing. Can that shift a bit in there or what could be causing this?
We're currently not using the stove and I will check this out when we do our annual cleaning in the fall when I take off the pipe, but I'm just wondering if I need anything to fix this.

A bit of a high-temperature grease probably can't hurt, any recommendations? Something graphite-based perhaps?

Thanks!

 

[stoveliker]

I would think that it depends on what part is scraping where.
Maybe it's simply the rod in the (asymmetric) oval thing that doesn't slide smoothly?
I use dry graphite powder indeed where surfaces slide anywhere on the bypass mechanism.