Installed the bdx 2 wheel kit on my o6 m7 the other day. Drove it about a mile and parked it. Looked at it tonight and both bolts holding the shaft to the rail was loose. Put loctite on the bolts when I installed them. I didn't put the flat washer back on the bolt when I installed the kit. Looked at the washer tonight and it looks like it is a type of lock washer. Does this need to be installed on the bolt or has anyone else had this trouble. I did tighten up the bolts realllly good when I installed everything.