Hey Nick,

The o-ring goes between the escutcheon screw and the hanger. Once the screw is through the escutcheon and protruding inside the forearm, the o-ring is placed over the screw threads and the forearm is then re-attached.

On some rifles a single o-ring does not make much contact. I know some have doubled up the o-rings but this often leads to a 'spongy' forearm. In this scenario, I prefer to use little rubber sleeves obtained from plumbing supply houses. They are available in a variety of sizes and lengths and are easily trimmed.

What the rubber spacer is supposed to do is isolate the hanger from forearm pressure and isolate the forearm from barrel harmonics.

I've seen varying results and I believe the modification cannot be truly credible unless one is using an inch-pound torgue wrench to adjust the tension on the rubber mounted screw. If the mod is done to a rifle and the groups tighten, it seems to me that the torque on the screw must be known in order to repeat the adjustment if and when needed. The rubber mount is really doing a similar job as the Hicks Accurizer, e.g., allowing variable tension within the forearm/hanger/barrel relationship.

I have not tried this with my 500 yet and I'm reluctant to do so as it is currently shooting under an inch at 50 with irons. This may be a result of the wood fitment performed at SSK during the conversion.

I've got a used and abused #1 coming in soon that I have free reign on. I'll be trying a few different mods in a manner that should qualify and quantify the results better than I have done in the past.

I'll keep the list up to speed.

Regards.