Not familiar with the Shimano=style dachshund. I have heard about the allen screw falling out in the older style clipless pedals but nothing recently.

As for the cleats: I picked up the black Look Delta Cleats last night and the manual said there were 2 types of cleat -

Red which has 9 degrees of float but was adjustable with the Free Arc Pedal from 9 degrees to 0.................and

Black which was a fixed cleat with no adjustment allowance even with the Free Arc Pedal.

I know there is a grey cleat - I've seen it somewhere, but it must be for the Keo Pedal?

Don't know anything about the Free Arc Pedal but my pedals say Arc on them - so I guess todays journey will be finding a manual for my pedals!

As for the black cleats: my knees, my feet and I are madly in love again and we owe it all to the black Look cleats!

oh - and with the new cleats?.....I had to tighten the tension on the hinge some - it was too loose! Man I Like these pedals!!