See there, you can see that the line these three pedals form is that the middle pedal RAISES the ones next to it. You can see them slightly taking off from the floor at the outer edges of their case. If you throw more in line, all it will do is kind of a massive see-saw effect that whenever you press on the outer pedal, it will act as a lever for the rest of the pedals in the chain, and LIFT up the outer ones. Now, try cramming all these pedals down with velcro and screws, and you - literarelly - screw up all input jacks as there will be enormous stress on them.
EDIT: That pic is a perfect exhibit A. Think of how they fare, if you stick them firmly onto any pedalboard, so they will not move? Flat. They will produce enormous stress on the circuit board inside, and will forever induce excess force downard at the circuit board inside, which you don't see from the outside. Well, the offset couplers will work... for a while. Guess what happens every time you step on them?
Avoid. I use them as dummy plugs for putting into input jack 1&2 to get some sound out of some tube amps, and get "just a load" in front of a volume pedals used as an Delay expression. I'll use George L plugs for this purpose too. George L plugs sux big time. But that's OT. Enough of threads already on that one.
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