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Hey Glen,
Locking nuts when actuated will actually cause a small amount of movement in the primary mirror away from the collimation you just painstakingly worked on achieving. Using stronger compression springs is by far the easiest solution. Using the stronger springs makes the locking nuts redundant, but is does also make the primary mirror more susceptible to needing more regular collimation tweaks. But this is nothing compared to having a great collimation result kicked away by "locking" nuts - bit of a contradictory term really.
All my Newtonians use stronger springs. I never liked locking nuts, and was only too happy to ditch them altogether. Even in my 17.5" dob, no locking nuts here either, and the springs hold collimation without any problems during a night's session.
Mental.
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