There are a number of people shooting Shrews and other lightweight bows with the EFA bow quivers. The EFA bow quivers are designed for the archer/bowhunter who doesn't want their bow to be weighed down by the weight of a heavier quiver, or their bow to shoot differently because of the quiver. The standard EFA 4 arrow quiver weighs about 5-5.5 ounces which is much lighter weight then most others.
I have personally shot a Saluki horsebow, Toelke Whip, Black Creek Banchee, Bob Lee Hunter, Belcher longbow, and a Beeler longbow with the EFA bow quiver with no noticable effect. Last year I won the "Eagle Eye" competition in Denton Hill with the combination of Beeler longbow and an EFA Cherokee J-1 bowquiver.
Some of us prefer to shoot a quiver with the hood and arrow grippers in line with the limbs, and some of us want the arrows (fletch end) more in line with the limbs. EFA does make an extension to accomplish this. Only on a few bows do I prefer to use this, however others will want to use it on their bows. This item (4" extension) can be installed on any of our quivers.