How can you reduce the amount of vibration in a bow after the shot? The bow is a fiber glass r/d longbow. The vibration is not severve it just resignates for 1-2 seconds after the shot. I am not sure if this is actually hand shock.

Brace height, string material, arrow weight, etc, can all influence how much or little you get along with bow design.

That seems like a long time for vibration. Are you using any type of reducer such as padded  or wrapped strings on the end of the recurve, where they come in contact with the limbs on release?
My 57 Kodiak was terrible until I added Bow Hush.

Is this string buzz? Got any string silencers on the string? Sounds like string buzz to me.

JL

I put string silencer on, but I did not see alot of difference. I will try it again with silencers. There is not a lot of limb to string contact on the bow. I have adjusted the brase height 7 1/2 to 8". I will work with that some more.

Try placing them at 1/3 increments on the string (1/3 way up and 1/3 of the way down on the string). Has to do with string harmonics.

JL

I would still try wrapping some yarn around those string ends where they contact the bow. Don't even install permanently, just find some and give it a solid wrap down past contact point.

Thanks guys I will try moving the silencers and the yarn on the string.

Is it a fiberglass longbow, or a fiberglas laminated longbow?  Those old solid fiberglass bows weren't always tillered that well.  That causes some serious rockin' and rollin'.

Fiberglass laminated bow