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Which method do you prefer?
I used to go with A, thinking less contact with the rail and less friction. Wind would usually blow an Estes model on a rod into this orientation anyway. However, I worried that a top heavy rocket may torque/bind the buttons. This forced me to add a 3rd rail button near the CG on some models.
Method B may be more secure riding up the rail with just a minor friction penalty.

I used to go with A, thinking less contact with the rail and less friction. Wind would usually blow an Estes model on a rod into this orientation anyway. However, I worried that a top heavy rocket may torque/bind the buttons. This forced me to add a 3rd rail button near the CG on some models.
Method B may be more secure riding up the rail with just a minor friction penalty.