Seven Oh Three: I am in Canada, but I have a USA P.O. box which can lower shipping costs for my US customers. Please contact me through my website and let me know what you would like and I'll let you know what I can do:
My suggestion is to have them done right or don't do it, or at least don't pay much. I work on customer supplied harps as well, and provide the best job I can do for very reasonable prices. ---------- www.spiersharmonicas.com Harp repair and upgrade menu
FWIW, I've had Joe (harpwrench) customize around two dozen harps for me. His work is consistently top notch - the harps play like a dream - and he delivers when he says he will.
Jon Harl specialises in seydel, but I don't know his contact info. Can find him through the Barrett connections. Also Greg Jones in Texas is the seydel authorised repairer, 1623 custom harmonicas.
It's perhaps not a fair comparison because I've obtained custom harps from different folks at different stages of their game and mine, and my requirements have been different, and their offers have been different
But
The harps I'm really happy with are from Joe Spiers.