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String stops are like any other accessory, it has to be setup properly to work correctly. Its purpose is to ostensibly quiet the bow by reducing the string oscillations. For that to happen, and to not just transmit the energy through the rod into the riser, the material has to have the exact correct amount of compressibility. Just like shocks on a truck, too soft and they bottom out, dampening is insufficient and energy is transmitted to the frame, to stiff and it transmits the energy to the frame more than it dampens. Like shocks, the string stop has to be tuned to be effective ... and that means if you change DW, arrow weight, etc. the tuning requirements also change. I consider the design or the Dead End and C.T.A. to be better than just a hunk of Navcom material on the end of a stiff metal rod.
Assuming the string stop is tuned perfectly, then the question arises about how effective it is on a particular bow. If a bow has a lot of vibration (noise) or string oscillation, most older non-parallel limb bows fit into that category, then a string stop can make a noticeable difference. If a bow has little vibration or string oscillation, most parallel limb bows fit into that category, then there is little work for the string stop to do and any effect would be small. Claims that the string stop improves accuracy lack any evidence that can't be explained by poor nock fit, IMHO. Accuracy only depends on the nock separating consistently from the string at the same moment in the string's travel to achieve consistent arrow velocity. Proper fitting nocks do that. A string stop theoretically could force a poor fitting nock to do that also, thus an accuracy improvement would be noticed. But, this is accuracy at extended ranges, not at 18m where variations in velocity mean little. At best the argument for string stops improving accuracy is that they are a band-aid on a problem. Claims that the string stop increases arrow speed likewise lack any evidence that can't be explained by poor nock fit. I have shoot through a chronograph with and without a string stop to show there is no velocity change with a proper fitting nock. I have also shot test groups at 20 yds with a Drenalin fitted with an STS and without an STS and consistently stayed in the X-ring. Any accuracy improvement came from arrow vane control and FOC... With and Without [img]http://forums.mathewsinc.com/images/userpix/8674_STS_001_1.jpg[/img] [img]http://forums.mathewsinc.com/images/userpix/8674_STS_002_1.jpg[/img] With... [img]http://forums.mathewsinc.com/images/userpix/8674_Feathers_CEP20_1.jpg[/img] [img]http://forums.mathewsinc.com/images/userpix/8674_Flash_20yd_group_4.jpg[/img] Without ... [img]http://forums.mathewsinc.com/images/userpix/8674_Stealth_001_2.jpg[/img] I see no useful purpose for a string stop for target shooting unless you are shooting an older, non-parallel limb bow that is beating you to death, like my Browning 6T6 with the hatchet cams. Frankly, I have tried an STS on it, with Limbsavers and String Leeches, and the bow destroyed the String Leeches in less than 100 shots, and the Limbsavers didn't last more than about 500 shots, and the EDS stopper was too soft with most of the energy transmitted into the riser and the string blowing by it, wearing it out ... the end result was disappointing. ... but I use a string stop on my hunting bows to prevent string slap on bulky camo clothing, raingear, 3D leafy suit, etc. Just my
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