Re: Bumper Designs
 

Just throwing it on the pile. For the last few years, 1675 has been using "locking pins" similar to the "squared retainer" style here, and 2 sets of bumpers. The pins go through 2 angle brackets from the bumper on the top and bottom of the frame and the frame itself. Sometimes it is a tight fit putting them on with components inside the frame but you can always bring the lock in at an angle as opposed to perpendicular.

Re: Bumper Designs
 

FYI,

These types of fasteners are used in racing a lot to mount panels. They have better engagement and clamping force over the pin method. Also the hardware can be retained.

Dzus and Southco quarter turn fasteners.

http://www.dzusfasteners.net/categor...us-Combo-Kits/

http://www.southco.com/product/default.aspx?hid=7345