I back my limbs down 4 turns each, and put a little sticker paper on it to remind me of such come spring. Come spring when I'm shooting again I simply crank it back up, and check my tiller. Why I do it is becasue I've had past compounds loose strength over a period of 3-4 yrs. If you hang onto your bows 5 yrs or better like myself I think its a good idea. How do I know my bows have weakened? I shoot back to 50 & 60 yds quite often for 3d shoots, and noticed the difference in drop over the yrs. No I do not shoot light arrows for this purpose. I shoot 3d's with the same setup I use for hunting.