On Sun, 05 Feb 2017 22:55:29 -0000, newshound wrote:

On 2/5/2017 9:17 PM, Harry Bloomfield wrote:
Mr Pounder Esquire explained on 05/02/2017 :
PVC frame will have steel structure somewhere behind it.

The somewhere is the problem.

Small metal detector?

Rare earth magnet will localise it better.

Couldn't you spell neodymium? :-)

IME the only good way to do
it is to explore with a small drill, and hope you can conceal "misses".
This was what I did when fitting a stair gate hinge for son-in-law. In
that case I was happy that self tappers (in shear) would be strong enough.



--
Reason to smile: Every 7 minutes of every day, someone in an aerobics class pulls a hamstring.