Hey, if you wanna use this WA, you have to know which length your cast bar has. It is anchored to the cast bar, so you just need your length and divide it by four, then input the result into "Distribute Horizontally" in the "Group" settings.
Example: Castbar length 310 pixels, divided by 4 is 77.5 > input 77.5
Anchors to ELVUI castbar only. You have to change to anchor if you use BlizzUI or another castbar addon.
You can edit the thickness and the height of the ticks by going to the individual ticks in the group.