Ed
Nice work. Just a word of advice, you are on thin ice. When making inexpensive strops, it is very easy to contract PSAD (Pasted Strop Acquisition Disorder) and the next thing you know you are pasting on every fine granular product in your house, and those of friends and neighbors. It is very addicting.
I have made crape loads of cloth strops, Denim does fray and the seam is a problem if sewed, but fraying does take some time and you can get much good use in the interim. Burning the frayed threads with a flame if they are cotton works well, be careful if poly cotton, it can go up literally in a flash, quickly.
Denim holds paste and cotton fibers do polish very well.
You can purchase 2 in. D-rings from Ace Hardware locally, here in the US and can easily make a 3 in. strop by cutting notches as seen in the photo, one ring on each end, to hook your thumb and to hang.
I use iron-on fusing tape instead of sewing. It is applied with a hot iron and is inexpensive at fabric stores. It comes in small rolls and sheets so you can cut for larger applications. Some of that stuff will tear the fabric before the fused joint gives up, bonds way stronger than we need.
Also at Ace Hardware are the swivel clips, about 2-3 dollars in nickel and make the strop swivel nicely, very handy especially if you paste both sides, as I do. Add a length of cording and you are all set for just a few dollars. You can also attach multiple strops on a single swivel, very handy for late stage PSAD.
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