I am having the hardest time finding a 1/4" shank, 1/4" radius (1/2" diameter), bullnose router bit with a bearing guide. It's almost as if there is some mechanical reason why this bit can't exist?! I see this bit with 1/2" shanks in various places or a 1/4" shank but without the bearing, but nothing is like what I described.
If there is a mechanical reason why I can't find this, please explain (like, "routing bullnose puts too much pressure on the shank...", or something). I would be interested to know.