The rivets to attach the two canvas tabs to my CMP rear curtain, have now arrived.
In order to cover all bases, I have bought three different styles. One is 3mm thick shaft with flat head. The other two are 2.5mm thickness, with one of those having rounded head, the other flat. All three are copper, for ease of forming. I won't need them to be particularly strong. The two pieces of canvas will be invisibly sewn together, with that sewing being entirely (I hope) hidden beneath the metal plates that the rivets will hold together, with one each side of the curtain.
In the interest of overkill, I also have a strong fabric glue that will be used as well.
The rivets were deliberately ordered in excess length. Once I determine how long they actually need to be, I'll whittle em down to size.
If for any reason I bollocks the job, by inability to form the rivets well, or causing damage to the metal joining plates, I have a backup plan. The fasteners for that plan are yet to arrive. Hopefully won't need those.