Lets say you have a silver mounted pernambuco, or just a silver mounted violin bow.

It's 4/4 in size.

You can buy a cheap violin bow with real horse hair on it, and a cheaper frog and mount that on it. Matching the size, they need be almost same length.

Just take the frog and screw off, remove the hair from the tip. Destruction of the tip block might happen, but the block don't matter anyway because it will not match size needed.

Stick the hair tip into the tip of the bow needing hair, then jam paper into it for a block. It can be tricky finding the right amount of paper for it. It needs to jam it tight, without coming back out. It also needs sit flush with the bow.

Now if you can cut a piece of maple instead, you should do this. The paper does not have a good of acoustic property as your maple wedge.

Then just mount your frog on it without twisting the hair.

Sometimes you need adjust the height of the screw hardware to make it fit.

You will find out that those frogs are universal with almost any bow of any age.