[Spridgets] Distributor question

[Bud Osbourne]

Is there anyone out there that restores Lucas 25D distributors, and gets
the advance curve just right?  Or, is there a source for replacement
springs (for the mechanical advance).  I have a pile of old
distributors, and could probably, by trial and error, come up with the
combination of parts that gives me the advance curve I want for my
basically stock 1275....but I don't want to make a career out of it.
One of my Triumph buddies has a Sun distributor machine, but, I just
don't have time to mess with it.
I see APT has new 45Ds available, but does anyone know how the stock 45D
is set up, as far as advance curve?  Basically, I'd like to end up with
a distributor curved like a '67.
Thanks.
Bud Osbourne