I' ve been doing this since the Vibrablocks came out, and I have absolutely no way of quantifying a reason other than a theory or " common sense" [8D] (yeah I said common sense!)
The Vibrablocks are heavier, and although I am convinced they work pretty well from actually trying bows with and then without them installed alone..........They are a bit heavy and I think the SIMS Limbsavers are better in the " normal" Limbsaver position on the limbs. So rather than just scrap them altogether I figured why not get them down against the riser/limb pocket where they surround the entire area to help with vibration at this connection between the 2 parts. I know it can' t hurt, and in that location speed loss should be near zero.

One thing I have noticed, and JeffB pretty much started the Limbsaver experimenting a few years back...........thru us messing around with them in different places the BowTech Gordon Glass limbs seem to like them placed at the spot where the limb is almost completely tapered into the body of the limb vs. way up near the limb fork where SIMS suggests.........This has been tru on my Mighty Mite, Pro38 Dual Cam and my Patriot last year so there must be something to how the energy is quickly concentrated at firing to this area of the limb allowing the Limbsaver to absorb more of it.............You guys buyin' this?

Frank(PABowhuntr)........you out there?.........this post has me longing for the rubber tubing in the riser cutouts again!! Boy we could make a perfectly beautiful bow hideous in a hurry couldn' t we!?[X(]