I use sulfur powder, smells like rotten eggs but it works great.
This is the magic ticket. Sulfur smells of success.
I do one of two things with these small center cuts:
1) Before attaching the scion, dust the "top" end of the center cut (the one touching the paper towel)
EDIT: I do not recommend this, I had a batch of 1/2 scions lost to rot:
2) Once the graft is healed, cut off about 4mm of the top and then dust with sulfurDefinite +1 on the superglue idea. Never heard of that.
Sorry I haven't gotten back to this sooner, I've been terribly ill.
I'll do a full write-up and picture description later today,
Hcc