Use this choke plunger or toss it?

 

The picture isn't good enough to tell.

I'll get a better one.. 

Second try at better pics. 
Was wondering why my iPhone was taking shitty pics.. then cleaned the lens... 

All 3 appear to be 'grooved' from constant seating. But ok to use or not? 


More pics
 
 
 
 

I do have some new ones, without the 'tit' but am running out of new aftermarket parts to refurb all 6 racks. 
Which is why I'm trying to determine if these OEM are serviceable  or not.

Most importantly, how would one test? 

Thanks for helping me be more carb proficient. 
I know I ask too many stupid questions.
But I'm just trying to learn and get better.

Don