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AS you have found out, the mirror springs on the collimation bolts on the 12" GS Dobs (lightbridge included) are too weak. Unless you replace them, you have to use the three locking bolts as well as the three collimation bolts (nice and tight) so you get a push-pull arrangement. That's the way I used them. Makes collimation a bit more tedious (need screwdriver because everything is very tight), but it holds the mirror cell very firmly.
Screws holding mirror clamps will tend to come lose as well and will likely scratch your mirror, especially if you have loosened them to take pressure off mirror as recommended. You need to apply some Loctite to the threads for transportation.
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