The DAR Patriot Index lists the following which was sent to you previously:

SHAFFER, John
Birth: PA 13 Jun 1755
Service: VA
Rank: Pvt
Death: VA 27 Apr 1847
Patriot Pensioned: Yes Widow Pensioned: No
Children Pensioned: No Heirs Pensioned: No
Spouse: (1) Eve Kelknar

This John Shaffer did have a son William. However, this John Shaffer died in 1847 in Washington Co., VA, not Rockbridge Co.

I hope this is of some help to you.
CNelson
This is a free lookup service by DAR Lookup Volunteers.