While they are positioned differently in the QMX, I did see suggestions for glue.? Haven't used glue and have no adverse effects.? If you watch a video of Hans adjusting a QCX, you can see toroids being pushed every which way and he doesn't seem concerned.
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Good luck with your build. These are AMAZING little radios!
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72 de N4REE, Bob Easton - QRP CW forever
N4REE - Bob