A wood working, steel T nut can be re threaded 5x.8 metric to use the bolts that come with the cleat.
Its a round hole .
use some more Carbon Fiber to fill the old one in..
probably add some on the inside to make up for removing the original shimano nut plate..
what you add will stick up because the new place wont have the recess ..
hope your new Insole hides its feel.. .
Last edited by fietsbob; 02-08-16 at 06:06 PM.