This is normal. As @Focomatter mentioned that was standard in later Normas. I don't think the adjusters on the earlier models aren't supposed to be used a locks, but adjustable tensioners. I believe the later models has a small set screw that could be used to adjust tension.
This is normal. As @Focomatter mentioned that was standard in later Normas. I don't think the adjusters on the earlier models aren't supposed to be used a locks, but adjustable tensioners. I believe the later models has a small set screw that could be used to adjust tension.