Ok, so my 5 year old has lost the D-key for the surge brakes on my Pirata trailer this weekend.(For whatever reason he thought he needed to take it fishing on our other boat.) Anyway, in looking for a replacement I came across a UFP trailer lockout mechanism that replaces the plastic cap on the trailer tongue that you can spin to lockout and unlock the brakes for backing. Have any of you guys any experience with these? I've gotten mixed reviews for them.