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I watched the video at 3x speed right up to the point when you installed the router bit then dropped the speed to .25 even at that speed when the chuck came free it was near relativistic speed. I even viewed it frame by frame in less then 2 frames the chuck was there then it was gone.
Thanks for sharing this video really brings to light the things that can go wrong even on well thought out builds.
Like was stated a slightly extended nose to the grinder with another bearing and a shaft extension could and would help.
A long time ago I had a 5" angle grinder that the gears wore out in this was a 9 amp grinder so it was quite robust about 2/3rds the size of the 9" grinders
I had been needing a pencil type grinder for a while so I made a nose cone out of aluminum billet about 5 inches long and a shaft with 5/8 11 thread to accept the cone and cob stones most are rated for 24 to 36,000 RPM and I bought only the better grades anyway. I used 2 bearings in the nose cone and a short coupling to connect the motor shaft to the arbor shaft the grinder lasted me for many years pre grinding welded up bearing bores before I line bored them
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