Belag brass for your sled, one pice.
When you put it on your pulka so make sure you get new holes to screw.Pre-drill with a 2 mm bore to prevent cracking.
If the wood is worn down it is possible that the screw goes right through the sled. Then you need to cut the screw a few millimeters, it's no problem because brass is a soft material.
Remember to be careful when you screw in the screws because the brass is soft, so can the actual groove in the skull be destroyed. then remove the screw and use a new one instead (it's included some extra)