if there is a size mismatch between stock and scion. You could use the modified cleft like TNHunter suggested.
But i personally do almost exclusively chip budding.
-It works both when the scion is thicker or thinner than the stock.
-It uses very little scion wood.
-You can do multiple grafts on 1 rootstock. (backups or multiple varieties)
-once you practise a little it’s a fast graft
-little chance of damage/knocking the graft loose from birds or transport after bench grafting.
-easy to wrap, since the grafting “style” keeps the scion bud in place.
2e picture, it’s hard to see. But the scion was much thinner than the stock here.
3e picture. The buds where from a scion that was much thicker than the stock.
These pictures are from dubbel chip bud grafts. (to get 2 opposite side branches on the same spot, for espalier tree’s)
this video is nice if you want to learn to chip bud
