Magnetic Parts pickup with quick drop

I have a big one of these I made with a large Magnetron magnet but it just won't fit in small places so I made a smaller one.

I ordered these Magnets from Amazon.
https://www.amazon.com/gp/product/B074BP1FR8/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1


Unfortunately they were not 1.26 inches in diameter but were 1.16 inches in diameter so I made a second set of files to accommodate the magnets I received. I see a lot of magnets advertised as 1.26 inches or 32mm. Mine were closer t