Question about Lee Classic Cast shellholder insert

[Willbird]

I unscrewed the shellholder insert from the top of the ram on my Lee Classic Cast press. The bottom end of it is slotted 4 places like a collet. What is the purpose of the slitted portion ?

The bottom of mine looks like this....

https://www.titanreloading.com/wp-content/uploads/2021/07/1388.jpg

But It does not have that "twisted" geometry at the top end, it looks more like this which Titan says is for the Classic cast press. The one they picture does not have the "collet" looking feature though.

https://www.titanreloading.com/wp-content/uploads/2021/07/2921.jpg

OK so this picture shows better the feature I am referring to.

https://houndsden.ca/product/shell-holder-insert/

[Land Owner]

Oooooohhh you're not supposed to pay attention to the man behind the curtain.

Didja ask Lee Precision or Titan Reloading?

[Willbird]

Oooooohhh you're not supposed to pay attention to the man behind the curtain.

Didja ask Lee Precision or Titan Reloading?

I did not ask :-).

[kywoodwrkr]

Pressure to hold in adjusted place for priming arms?