We have kicked bamboo poles heavy bags and rolled glass coke bottles on our shins I will say I do have tought shins but it was very painfull geting there
I have a frayed belt that I have retired and have purchased a new one I have seen many sensei's in Okinawa wear frayed belts None that I know have keyed them just alot of hard training
I have two hand made makiwara at my house one in the back yard on a post in the ground the other on a tree in my front yard. this one I also do my kicks on I train on them almost every day.