I saw a tennis bracelet pattern in Bead and Button book. I have made quite a few of them for gifts for my family although I used 6mm bicone crystals instead of the 4mm the instructions called for. The best one I've made so far was for myself, it was made using 6mm crystal AB. What I'm asking you is this: The pattern calls for mono filament beading thread. I am wondering if this line is going to get cut using the bicone crystals? Also, the pattern calls for a box clasp, mine keeps coming apart every time I wear it--what else can I use instead?