Most other rests are modified by adding something, tape, moleskin, nailpolish, chopped up doinkers, or whatever else the creative mind can come up with. The whisker biscuit on the other hand works quite well without modifications, but offers the option for the creative mind to take something away and perhaps improve the performance of the rest. The truth of the matter is this, the whisker biscuit rest will last for hundreds of thousands of shots as is, and those who have well broken-in biscuits will jealously guard them for their own use and will not trade them for brand new ones. How can we accelerate this wear? Its easy,use a pair of sissors. I generally only flatten the back of the biscuit myself, and yes, it does soften the biscuit alot when you flatten both sides. I use 4" straight Duravanes and the rest as it came in the package was 1FPS slower than a TM hunter.With high profile fletches and the more helical the fletch, the more that can be gained by modifying the biscuit.