9 inch front left side drum Richardson, TX

Well I could not stand it. Goggle searched drum swedge cutting tool. Looks like an over size spot weld drill. Found one for 1/2 and 9/16 inch studs. It all makes sense.

At this point, is new drum allowed to float like rear drum held on by wheel lugs? If not how is new drum fixed to hub?

If you Google the following, you'll come up with a few threads here with alternatives to using a swege cutter: "7 16 swedge cutter site:www.forabodiesonly.com" Ignore the hyperlink, and just put the quoted part in the Google search box.

Yes, the drum floats, as you say, with the clamping force of the wheel squeezing it plenty tight.

Before I started cutting or drilling, I'd be checking out Hyper_Pak's offer!

Good luck.