How Are "slots And Slits" Cut For Bushings?

What about starting the slits, half of the depth, on solid round stock, then drilling open the center hole..then finishing the slots?
 
When I used to make them in work. I drilled the ID undersize then turned the ID and OD at same time to be concentric. Then I would hold the part in a vise end against the jaws and just a slight bit of ID visible at side of jaws. Then using a slitting saw I would mill a slot. If multiple slits are needed I would them put a shim in the 1st slot and use a sign bar or angle block to position the part at the right angel to cut next slot.
Glad you said that. I don't have much experience cutting slits, but I need to for a project and that's what I was thinking of doing. Thanks for confirming that it works well.
 
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