My concern is screwing the "cheap" plasic insulators into the fence. I have been told that the screws occasionally strip out of the vinyl . The total cost of the cheap insulators is $160.00, and about 5 hours of work. Another advantage I see is that this method has a low profile, and thus would be more attractive (which is a very high priority on my project)
On the other hand, there are these "snap-insulators" that just clip on the rails. Very convenient to install and move from rail to rail if I so choose. The down side is $480.00 and it will mess up the esthetics.
So...... my plan at this point is to either use self-tapping screws (either #6 or #8) with a light torque setting on my drill, OR drill a pilot hole and either use the lowest torque setting on my drill or hand tighten the screws.
Any suggestions or pointers from people who have done this?