Reddit reviews Greenlee 645-011 Small Arbor for 5/8" - 2-1/4" Kwik Change Carbide-Tipped Hole Cutter

I too have this p roblem, so I went googling based on u/Rawthebuilder's comment.

Scroll down for "hole saw ejector spring.https://www.wonkeedonkeetools.co.uk/holesaws/what-are-the-parts-of-a-hole-saw/

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>Some arbors come with a spring placed over the drill bit called an ejector spring. This spring uses stored mechanical energy to eject the slug from the cylindrical saw blade after your hole has been cut.

There are diagrams.

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I wondered if you can buy an arbor with the spring, and use it with your existing hole saw blade, but I didn't have time to google that much.

But there is this:

https://www.amazon.com/Greenlee-645-011-Change-Through-4-Inch/dp/B002NQTLOK/ref=sr_1_15?keywords=hole+saw+with+ejector+spring&qid=1567995642&s=gateway&sr=8-15

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Also--search r/woodworking for "hole saw"


found this: How to Clear a Hole Saw--the easy way