Beni Kawa Japanese Maple / damage & graft

[Uncle Freddy]

hello all ...in an odd and very high mph wind storm here on Whidbey Island in the Pac, our Beni Kawa Japanese maple suffer a section of trunk / branch getting torn off, I removed the biggest section and then reattached (grafted if you will) with multiple zip ties ....I am being told it will need a stainless bolt thru the trunk just at or below the high split area but I need to know if this needs to be a lag bolt (ie: drill a smaller pilot hole and then drive the bolt thru utilizing the threads to pull the 2 split sides together or use a threaded bolt with nut and washers on both ends ? I would assume the correct sized lag bolt cutting thru the trunk wood tightly would be best path, but I have never done this before so all advice / insight / feedback appreciated .....THANK YOU

 

[Raintree]

Not much weight involved here. 3/16 threaded rod stainless or brass with nuts and washers will work. I would look to install two one above and one below the crotch, not parallel on the same plane.
Remove all those zip ties before bud break next spring.

 

[Uncle Freddy]

hello again ....update on my BeniKawa jap maple graft after wind storm break, see pics, the section that I reattached seems to've not done well / taken, the main trunk sections never developed their full winter red color and the tips of the branches of the side I reattached are showing no new Spring bud growth like the dark red healthy branches ....not sure what I should do next ?? all insight & assist appreciated, thank you