MTK,

I have also been using this method for years to install sockets into wings. Why Iam asking is for a kind of check and balance.
The separation of wing from thrust line Iam using is 5-10mm down to the max thicknes of wing.
Well, all the figures remain to be verified as soon as the temperature rises some, currently it is well below zero and forcast is bad temp. vice.

Good luck with your re-build.

Best regards