Get what they call an EZ out like the above post said. Or just replace the mast and mount. Not hard . But yu will need to remove the rt side wheel fender liner. Yu can handle it. But first yu can even try to drill it out. Using a center punch to start your center, then use a i/8 drill bit at low speed , then move up toa 1/4 inch bit, then use the drill in reverse with the next size up. Got the idea.
Personally I would just buy a new mount and mast. And save the time.