Should nut slots be cut V-shaped, or semi-circle?

Eccentric nut 6mm for V-Slot profiles - v slot nut Różnice między nakrętkami T-NUT M5 a Drop In Tee Nuts V-Slot Openbuilds #shorts viy slot TIP: To make assembly easier, before sliding into the slot put all the components together first and screw into the slide-in t-nut 1-2 turns

vga slot FLAT HEAD DUAL T-NUTS OF MS SILVER ZINC COATED FOR V-SLOT AND T-SLOT ALUMINIUM EXTRUSIONS FOR M5 THREDED SCREWS; PACK OF 10 PCS OF DUAL T-NUTS FOR M5 SCREWS