I invested in one of these 'micro adjustment buttons' recently. I found that the length of the barrel was barely long enough to go through my FiberBow carbon riser. I substituted the supplied locking ring with a narrower one for a US shibuya and that cured that problem. When I used it my arrows were acting weak (going right I am a RH archer). I decided to take the button apart and insert the strongest of the springs supplied. When I examined the standard spring supplied with the button and compared it with the other two supplied IT WAS A 1/4" SHORTER! So if you have one of these buttons check the length of the spring. My arrows are going straight now wth the stronger correct length spring.