I have used it on ornamental trees with mixed results. I had difficulty getting a 'reasonable' good contact with the cambium of the scion and stock. Tying them together to maintain contact is also chancy. It does work if you are VERY careful or VERY lucky. Al

That's what I was afraid of- seemed like limited cambium contact- bet it would work best if plugged into younger bark.

This is a old trick and not something I would do, correct harvestman, cambium contact is very little, my bark grafting gets probably more then 10 times.

Konrad

Here is a link that might be useful: Bark Grafting

I think the advantage of this thing is being able to put the branch exactly where you want it.

If the bark is slipping on the recipient tree perhaps one might peel back a flap of bark before drilling the hole and then use that strip to tie into the sharpened pencil scion.

I'd be tempted to use a nail or something to secure the scion. Just was or seal seems like a loose union.