Thanks Marshall Will,
By using the Tandy Buckles, I was able to buy roller buckles so that the bottom of the straps (that connect to the Bag) are on rollers ... and tend to take any movement on the roller-to-buckle joint rather than catch a leather ....
But if I was gonna do it again, I would buy a bigger bag in a kit ....the bag makes a good place to put non historically correct things (like DateRunners and cell phones in).