Guidance on Slot tolerances

[MoreCowbell45]

I have a slot I'm trying to figure out, past drawings have a MSS on the slot and making a new Datum then a width single segment FCF. I think its wrong and should just have two position controls on the witch and height and get right of the MSS all together. the slot depth is a whopping .13 on the real part. just looking for some guidance on how to make this better or correct

 

[Burunduk]

The perpendicularity tolerance under the position feature control frame is a refinement of orientation, I wouldn't say it creates a multiple single-segment callout - that term is usually used for two position segments (with separate symbols). Whether the datum scheme with slot height as a datum feature is appropriate is a matter of function - what features constrain the degrees of freedom in assembly? Other than that why is there a diameter symbol before the position tolerance value applied to the length dimension?

 

[MoreCowbell45]

Thanks that's makes it more clean with you explanation, Sorry the diameter symbol is wrong and should not be there. I recreated this to fast from my actual part.