I would be concerned about the stress put on the fulcrum point by your lever extenders. Those pakistani levers are plated pot metal, and they are not really designed to take a lot of strain. Particularly with the extra quick shoving needed to compensate for the longer throw, you might run an increased risk of snapping off the lever handle.
Wow Michael, you sure put a lot of work into that!! I don’t know if I would’ve done so….
I had the same harp. My levers weren’t as stiff as yours, but I’ve heard about that. Mine were just… very bad. The tiny metal bar that pinched the string, was crooked. In all of the octaves, every F# sounded different. LOL! I just didn’t want to replace all of the levers.
However, the sounded grew a nice little pot belly on it, and the sound matured after a year. It sounded quite good.
PS: I had sold that harp, and the woman who bought it uses it to play with a group at church! They started a lovely little group and she’s having a blast! The neck did crack on the instrument, but she found a book to fix it, and apparently she did fix it!
Oh and robinsons or loveland levers,(which ones i cant remember..) worked good on it. I also heard of someone replacing the dupont nylon strings with Robinson Harp strings. Apparently the sound came out even nicer!!