If the shield is heater shaped, it has to be balanced. Suspend the shield by its leading edge's top corner. Drop a plumb bob line from the same point to the floor. Draw a pencil line along the string. Mark on each side of your clenched fist.
Opponents love to face fighters who loose control of their shields.
Last, but not least, the strap that holds your forearm in place. Two schools of thought govern this subject. With a washer on the bolt, insert it from the front of the shield. In conclusion this method of attaching the 10 speed bike tire edging, handle and straps will work to craft any style of shield you decide meets your needs. If, indeed a picture is worth a thousand words, then this honorable gentle has earned many thousands of thank you s from me.