Rucksack buckle - "Rock lockster" (Altus and highlander)

Fits and works lovelly. The orginal that this is derived from doesn't slice in slicer, so instead of repairing the original, I have simplied the model, and added a few features to make it simular to the orginal 'rock lockster' 1-inch buckle.

Also have included the Sketchup file to allow modification, some of the faces are inverted so send any modifications through a repair program (like netfabb).