Got to wait to see one at Harbor Freight.You trying to cut glass or metal around the glass?
I never tried glass, but steel tin, no problem,
Secret is steady hands like iron, so it stay straight in the cut and doesn't bind,
And Just enough pressure so that the rpms don't slow down to much.
And yes I'll take an electric angle grinder with a zip disk any day,
If it fits,
This is cool, pricey but cool,
Blacktip scooters should have a waterproof plug to plug in a cordless angle grinder...