Well don't try to replace them yourself...
My ****** ******* ******* cat ate my A2's antenna. I had another FUT 2.4 rec laying around. So I opened it up and popped off the antennas.
They came right off with a little pop. I opened up the A2 and there was black glue all around the antennas where...
Try different props. at that weight I think you will find the tri blades do not do it justice. I have (8) sets of one kind of 3 blade for sale, and (6) of the KDE... let me know if anyone wants a good deal... + LOTS of blades.. LIKE TONS