https://www.amazon.com/4380-11-125mm-Straight-Chucking-Reamer/dp/B07DWJ81C1Cor, gee wilikers . they want 15 bucks .
Was going to suggest skinflint method , wheras if a drill bit ( metric ) was within a gnats dick of korekt ,
it'd open it out . To far if you didnt get it wright .
As your 4380 = 11.1252 mm , a 11 mm drillbit , if you got out of the right side of bed etc
should get it spot on . Seeing a 7.65 drill threw a OS alumn. intake gave .290 , using a drill press . Which is about what I wanted !
Id use a Tap Handle ( Tap & die type ) on the drill bit . It'd want to feed in easy , or youd be stuffed .
The Reamer would be the decadent option , and presumeably failsafe .
Just thow your .4380 in. on google search , to find them by the million .