What they were saying was essentially correct. First all current systems use the same or similar centerpin positive servo plug there were some from airtronics many years ago that wired the plugs #3 pin positive that will not be an issue for you.

Now futaba choose to mould there plugs with an additional little index tab on the side and the purpose to not allow you to plug it in backward. So yes if you need to plug a Futaba plug into some other brands extensions or recieiver it would be neccessary to cut that little tab of and this is common practice with most of us simply because we have vast supplies of extensions switch harness etc. and we mix and match as neccessary.

Now yes it is possible to plug in backwards without that tab just as it is with all the brands. So what happen when you plug a futaba servo when the tab is removed into the extension or receiver backwards? Nothing, absolutely nothing it wont,t function so ya just pull it out and plug it back in the other way.

John