Stripped threads on evaporator line

[Beach_Benz]

1990 Mercedes 300SE
Engine 103.981
Chassis 126.024

I was replacing the a/c expansion valve and I overtightened one of the lines coming from the a/c evaporator going into the expansion valve. As a result the top two threads of the evaporator line fitting are a little flattened on one side. There was a definite leak at that line when I pressurized the system.

I had a friend suggest that I try a combination of teflon tape AND blue loctite on the fitting threads to "seal" the flattened threads. I wanted to get some other opinions before I try this.

Any suggestions will be greatly appreciated and, yes, I know now to be very gentle when tightening down copper fittings )

Michael C.