Thanks for your response HA. The thing is that the B67 rails have much less give in them than the standard Strida saddle. The Stridda saddle rails, I can flex with my hand, and can snap on as you suggest. The B67 won’t even budge.
I admit it may be possible to use the leverage of a screwdriver but I’m reluctant to do that as it’s a $100 saddle and I don’t want to scratch it up in the process if it doesn’t ultimately work (which would prevent me from returning it for refund). If I know it will work, I can live with that. But that’s why I’m hoping to hear from TBAKEL to get his direct experience with this specific saddle.