Typed in a long reply and my darn iphone lost it. Trying again on from Ubuntu.
Gordon,
AN4H is a 1/4" AN bolt with a drilled head for safety wire. I assume it is wired so the bolt doesn't fall out if it breaks, but I don't know.
No problems drilling the Ti. I drilled up in 3 steps, #30, 3/16", and 1/4". Slow going with the #30, lots of clearing of the chips and time to cool down. Bought fancy "cold fire" bits for the 3/16" and 1/4". The 3/16" worked ok, the 1/4" bit died immediately. Took out a plane jane black oxide 1/4" bit from sears and it drilled through no problem. I used the idea attributed to Bob Mika, didn't drill through until the very end so the hole would hold oil. That was genius. I used MM air tool oil rather than WD40. Started with WD40 but it was working poorly for me.
So my gear legs fit tight in the sockets, which is good. Hard to align the 1/4" hole in the motor mount with the 1/4" hole in the gear leg due to friction. I think I will taper a 1/4" steel rod and tap it in. Anybody want to share their technique? I plan to align the holes then finish drilling through the back of the motor mount.
Here is my drill press setup:
Here is the first leg stuck in: