Watch out, prolly you're not legally liable for damages occuring during you helping somebody with technical stuff when the one suffering from such damage asked for the help. So your insurance won't cover that either.
Case would be different when you snatched away (or borrowed) the device from owner and then applied some rework to it without owner knowing about and agreeing into it.

Just a heads up

[edit] I think you're more than just "suitable for this" :-) And thanks for the kind offer to help other customers.
/j