SVF-20 with a modified ILG8F21 blade

Exactly as the title says. Unfortunately the shaft size is different on the fans so the SVF-20 blade would not slide on to a ILG8F21 fan shaft.
I modified the ILG8F21 blade by adjusting the pitch of the blade. The other ILG8F21 fan I have has received the same adjustments. Unfortunately the grub screw became stuck on there so bad that I can no longer remove the motor shells or do a blade swap on that specific fan. (Yes, I tried everything. Please advise)