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Yes, replace the springs, one at a time, with a suitable stronger spring from hardware shop. Use the "locking screws" for transportation only. Loosen them off, then collimate with the three big screws. Ignore the "lockers" until it's time to pack up - then nip them up. Bounce the 12" tube for kms in the trailer and back out again next week, loosen off the "lockers", and you'll find collimation of primary has hardly shifted - that is my experience. The previous owner of this scope believed in pulling the primary well down on the springs to put them under significant compression, thereby reducing the possibility of movement.
Adding a stronger spring to the secondary mirror centre bolt is another good move. Collimation of my 12" survives many km of transport and handling with little change.
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