I'm not a fan of the NR helmet mount for the MiNewt/Sol headlight series. I simply took my MiNewt, and applied enough Blu-Tack poster putty to hold the light in place, and used the supplied O-ring to mount it. It's worked for over two years, rain or shine. Sure I have to reposition it nearly daily, but it's no big deal.

I use a PB taillight for the rear, using the supplied velcro, and a long skinny balloon (Qualatex 260) to hold it in place.