General Design Data:

The internal mechanisms of the CM1 rubber cowling mounts are the same as the MS245 and MS213 adjustable receptacles. The main components are a threaded barrel, threaded insert, locking clip and plastic anti lock pin. The insert is the portion that the fastener stud locks into. It has two vertical grooves machined on the outside diameter. These grooves are where the locking clip engages to prevent the insert from rotating after the proper depth has been acquired. For the initial adjustment we have installed a plastic anti locking pin underneath the locking clip on the outside diameter of the barrel. This pin keeps the locking clip from engaging until the proper fit is determined. These pins should be left in for the installation and panel fitting process but must be removed prior to flight and return of the vehicle to service.

Installation and Depth Adjustment:

After the fasteners, grommets, receptacles or shock mounts are installed, position the cowling or panel and engage the MilSpec C-Lock (Camloc®) fasteners into the receptacle. The studs should lock with the head protruding, this is normal. To perform the initial adjustment of the receptacle, simply turn the stud clockwise just like tightening a screw until the head of the stud is flush with the grommet (or stud cup when using 2600/2700 series). Proceed around the cowling or panel performing this operation at all locations. Do not go beyond flush as this will over stress the stud assembly.

Now that all locations have been fitted, the cowling or panel can be removed and the anti locking pins can be removed from the receptacles. To unlock the fasteners without spinning the insert you will need some fancy wrist action and a bit of a feel for it. The way to do this is to push in slightly on the stud head and with a quick motion, release pressure while giving the stud a 1/4 turn counterclockwise. This is not hard but, may take a few attempts to get it just right. Once the studs are unlocked and the cowling or panel is removed, go to the receptacle and remove the anti lock pin. If the pins are not removed and the inserts are not properly locked, the fasteners could potentially unlock in flight. The locking clip may not be lined up with a locking groove in the insert. Therefore, you will need to turn the insert with a flat blade screwdriver a half turn or so until one of the locking grooves in the insert comes around to the position of the locking clip. Be sure that the locking clip is engaged into the locking groove of the insert and not the fastener access slots. When the clip engages properly you should hear a positive snap. Verify that the pin is completely removed and that the insert does not rotate more that 5° in either direction using reasonable force. Proceed around the cowling or panel repeating this process at all locations. In some instances it may be necessary to press on the O.D. of the receptacle to help the locking clip fully engage.

In the event that the receptacle needs to be readjusted some time in the future, use the MilSpec pick tool or any thin pick tool and insert it into the unlocking groove of the receptacle. Properly engaged, this will lift the locking clip away from the insert enough to allow a flat blade screwdriver to turn the insert in the appropriate direction. Note that there are two locking grooves in the insert 180° apart. This allows adjustment in .015" increments. Typical C-Lock (Camloc®) studs vary in length by .030" so, with the MilSpec adjustable receptacles you can fine tune the fit of your cowling or panel in increments of .015" (equal to 1/2 of a typical stud length). After readjustment be sure to engage the locking clip into one of the locking grooves in the insert.

Installation Parameters