For those not looking at other forums it may be worth pointing out that the usual R8 and MT sidelock holders have the grub screw a lot further from the end so it does not easily sit on the cutters shank, Also the proper holder has two grub screws at 90deg as many cutters have two flats unlike the single flat on a milling cutter.
You also get the ctr pin hole if you want o use that.