[rodneym]

Your Cobra life will be made a whole lot easier if you learn to do some of these things yourself.
When I had a drywall screw in my rear tire (that isn't made anymore), I took it off myself and took it to a big tire place for a proper patch. Even if someone claimed to be be experienced at a place like that I wouldn't want them to hammer, let alone wire.
Olthoff has a youtube video that shows the basics on knockoffs. You end up using your ears to as much as feel when you get it right.