Chainsaw Repair

I made my decision on the drive sprocket setup for the YZ125 bikesaw.
I can buy a CNC billet sprocket with built in hub flange but they are heavy, I definitely will put one on the bigger CR250R but for the little YZ125 it defeats my lightening purpose.

So I just happened to find this NOS Sandvik 12T .404 .063 harvester sprocket on Ebay and also this 73mm x 30mm chunk of GR5 titanium for $20 out of Israel of all places!
Now I got the chore of finding a machinist who can make this titanium into a hub adapter for the sprocket and rope spool.

12T .404 is equal in diameter to a 13T .375
I always ran a 11T .375 on the YZ but always wanted to upgrade to a 13T for the "18 fat belly .050 bar.
Plans are to put 46RST HT cutters on a Oregon 50AL .404 .050" chassis.
Originally thought about a high tooth .375 with Stihl 33 Topic Super chassis but I think risk of snapping it would be high .
Here's the pics.

So on the continuing saga about my harvester rim sprocket for the YZ125 bikesaw(for those interested in building one for their hotsaw)
The ebay vendor sent the wrong one that I ordered but then it turned out it was the one I should be using.
They sent me the one I ordered and I was told to keep both.
On comparing the two one is a .063" and the other on the right is a .080".
So the first one they sent me the
.063 I will use for my .050/.404 chain.
The titanium piece came from Israel and when I showed it to my machinist he said no problem putting it on the lathe and making a sprocket hub adapter and rope spool.