Anybody out there that can help me. I recently spoiled myself by buying a Renzetti 4000 rotary vice. The bobbin cradle looks hugely impressive but I cannot work out how or when to use it - logic tells me it should be positioned at 90 degrees to the vice head but when it is in this position it just gets in my way - to preserve my sanity I have removed it but would really appreciate tips on how to use it properly.