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The best collimation systems do not use springs because they add an element of flexure.
There is a name for the mirror which is supported in a system that can hold a piece of glass whilst remaining totally inflexible, it's called "glass shards".
The reason for the movement is to absorb any shock that may be imparted to the optical system. So for a portable scope some movement is needed.
Remember collimation: Square focuser to optical and mechanical centres, then adjust your secondary and then finish with the primary.
I'd love a dollar for every cheap rifle scope that has come to me with imparted shock damage.
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