The advantage of using an aluminum backing plate with nutplates is that you can snug the bolts anytime you feel the need. Torquing bolts, even with washers, into lead is potentially problematic as the lead is soft and easily deformed - if it gives way a bit more over time, bolts can work loose even if the nut hasn't turned. Bridging the two holes with harder material and using nutplates addresses these issues.
RV-14A built/sold N14VB
RV-12iS in progress as of October 2020
Last edited by mturnerb : 01-06-2021 at 06:39 AM.