Was asked to do a write-up on "Slab Grafting" cacti as there is not one here nor much info online (even though the name pretty much speaks for itself). This style of grafting is a good way of really bumping up your numbers of a particular scion with only a small amount of material and gives great results.
This is the grafting stock I'll be using. I now prefer straight cuts but in the past I used to bevel the stock before placing the scion
This is the scion I'll slab
Cut the material into slices, as thick or as thin as you want
Then cut the piece in half
Line up the now vascular line with the ring of the stock and hold it down by whatever means of pressure you prefer
This was actually done a few weeks ago, not the scion above but you get the idea. TPM x Scop starting to pup
Play around with the method. You could cut the piece into quarters so it goes further