G'day Jack. Merry Christmas to you, your Mum, @Dawn_SD, @Dee & everyone else on the forum.
I only use a 2 frame hand spinner, it works well for me. There has been two of those spinners sold. The feedback was good & bad. One person gave it 77 out of 100, while the second person only gave it 20/100.
It IS best to use 2 frames of equal weight, however what I do if I finish up with one frame is spin it with an empty frame & crank slowly, turning the honey frame around several times until it is finished. By then, it is easy to turn.
If you're handy with your hands & metal, you might be able to beef it up if you find some things are a bit flimsy. The main thing is, you have the drum. It all looks fairly sturdy to me.
I've had my spinner for nearly 30 years & it's still going strong. It must have been over 30 years old when I bought it. I had to fix a few things over that time. It's a beauty. In that time I have never contemplated buying an electric one, even though people tell me I should have one.
Good luck with your decision. cheers