Hold on now, this is crazy talk! A stitching tool??!! The whole point of vulcanizing glue is to chemically bond the patch and tube, so there’s no mechanical bonding required at all. As
terrymorse said, it takes very little pressure to apply a vulcanized patch; just finger pressure.
If you need a tool to create a successful patch, you are doing it wrongly.
The things one needs to worry about are proper tube prep, applying a sufficient amount of glue, and the exercise of patience. That’s it.
I don’t even use glue anymore, only self adhesive patches, and they work well to the point that I can’t recall having one fail, so I don’t know why people mess around with glue-on patches at all anymore. Hell, I’ve had a Lezyne SA patch on a Schwalbe Aerothan TPU tube for 8 or 9 months now…