Hi,
I don’t use those split pins either as they are pants - they could take ages to remove if you have had a brakeage and needed to remove the drive shaft from the hub.
The Yokomo hard pins are a good idea but they are quite expensive and you only get 4 of them per packet.
Get these instead -
HPI part no 101239 - they are loads cheaper and you get 10 in a pack !!!
I have used these ever since I started running a B-Max4 several years ago and they are spot on.
Rob.