1
1968 Mustang / Re: 1968 San Jose GT 390 Fastback Drivers Side Mirror mounts
« Last post by Bob Gaines on Today at 11:31:09 AM »My original inserts on the driver side both spin. I purchased a nutsert tool from Amazon, the one with the long arms for leverage, and was able to tighten up both of the inserts. I used a 10-24 tap to clean out the hole and reinstalled the mirror using 10-24 Phillips Oval head screws, not the Phillips Oval head sheet metal screws that were installed originally.From the factory the outside mirror used the posi drive type machine thread screw. They have a counter sunk head like the generic mirror screws . Posi drive looks like a Philips cross head impression however they have a slighter different shape inside the allows for more torque to be applied without slipping. They are identified by 3 slash marks in between the Phillips impression . I believe that they are mentioned in the MCA rules. The picture I posted is to show the marks on the head. Disregard the flat head and sheet metal threads. NPD used to sell them but can't say currently.