From the hand of the largest manufacturer of bowstrings and fiber processor for archery use in Europe, comes the tool to serve your bowstrings professionally. The I-Winder by Flex Archery, now updated with new features. - New design, with weight distribution that favors the serving operation when turning, making the i-Winder optimal for making and repairing bowstrings and cables. - Truly adjustable thread tensión, either the serving material is thin or thick. - 3mm eye. No matter the serving diameter. Thin or thick. It will never go out. - Separate head, that can be replaced when needed. Sold separately. - Rounded corners for operating comfortably. - Ceramic Guide for extending the body support life. - The rigid frame does not bend when winding. - Independent spool/friction rotation discs. - The Polished stainless steel tension axis makes thread transition super smooth. - Stainless Steel axis. Super rigid reel support with one cone end for easy spool assembly. - Tension discs with different hardnesses. SOFT (blue) for thin serving materials, MEDIUM (red) for thin-medium and GRAY for thick serving materials. - Not serving damages when winding. - New design Stainless Steel Large Diameter knobs. More sensitive and precise adjustment of the thread tensión when winding. - Compatible with standard and FLEX reels. Empty reels are available for re-winder thread materials. - Multiple colour combinations for quick and easy finding. - Free sample of serving material included.