I know of several who have had questionable results from ASPSCO.
I would recommend starting with either of these first:

        Wyatt's Musical Americana
        Box 601
        Lakeport, California  95453
        (707) 263 - 5013
        Mr. Duane Wyatt

        Mr. Ron Sitko
        26 Tekakwitha Court
        Clifton Park, New York  12065
        (518) 371 - 8549

Both are considerably less expensive than ASPSCO as well.

Terry Baer
fourbaers4@aol.com