Any advice on Patch budding of Sweet Chestnuts?

Any advice on Patch budding of Sweet Chestnuts?

I have a 20mm dia ‘scion’ given to me, of a Sweet Chestnut tree, thgat is only 10 cm long. I have some Swt Chts rootstocks of a similar diameter. I was thinking that patch budding would be the only option.

Any thoughts please.

Anybody used dimethyl sulphoxide on the joints to improve the take.