[Harp-L] Thunderbird Weltmeister

[philharpn@xxxxxxx]

I have a thunderbird Weltmeister in the key of A that is bolted together with six-sided bolts. 


It has an aluminum comb and looks like the reeds are bolted (screwed) to the reed plate.
Coverplate also says: "Master harps since 1947" and "Germany." Is this a Seydel?


What kind of wrench (tool) is needed to open this up?


Thanks for any help.
Phil