The clamp system on any modern boom does 'snap' shut, this is a good thing as it means you get a nice solid connection between the mast & boom. Having said that, it should not be a super human effort to close the clamp over & maybe you should look at loosening off the inhaul rope (the little bit of rope at the front end of the boom) which controls how much 'squeeze' is put on the mast as you clamp the boom over.
Hope this helps you out.
Poole Windsurfing - Lessons & Hire
Phone: 01202 237247
Email:
info@poolewindsurfing.co.uk
Web: [
www.poolewindsurfing.co.uk]