I've been trying to come up with something simple I can rig for a jig to serve as a guide for the bit for that hole, as I agree that I expect it to be the more difficult to get clean. If I can come up with some PVC or something that I can rig up, I might be able to clamp it all together in a vise & do a decent job on it.
I live in a real small town. Not many options for getting stuff done. If I end up having to drive too far & pay to get something done, it approaches the cost of buying a press. Which I'd like to have, but really don't need bad enough to spend the money on. Isn't that fun? Make my own spring straps, in part bc I can do it $17 cheaper than I can buy them, but I need to buy a $100 tool in order to do it...