Wow, that's one finger eatin', err...I mean wood chippin' piece of arn!
I shuttered watching your cut on that, and especially with no push blocks.
When I was a kid in high school a friend of mine cut his index finger off at the first knuckle in wood shop. I was there, but didn't see it. It happened on the jointer. Gee was there a lot of blood... never found the end of his finger...
Unfortunately I will never forget that...
If it was me, I'd forget about dados, fix up that round cutter on the 2nd one, or replace yours. But it's not me, and it's you in your shop...My old Crescent 8 has a round safety head, so my next jointer will most likely be it. It does do dados, but I don't care much about them as I can do that with a hand plane easy enough. My Yates-American J-31 can do dados also, I haven't used it for that yet.
Be careful Jeff, you can always replace a machine, but you can't replace a finger so easily...my friend Jim will tell you...his has been gone since high school...