@Merlin5
I purchased a bird feeder earlier in the year that does an awesome job at stopping squirrels and pigeons from feeding on it. I don't mind squirrels myself so put some nuts elsewhere for them. the below has a weight mechanism so anything heavy shuts off the seed.
But, the squirrel that comes to my garden hangs upside down from the table by its tail and grabs the feeder cage with it's paws and then just puts its snout into the food hole. I'm thinking it might do the same on the buster which would bypass the spring mechanism.
I just watched some videos on the squirrel buster and didn't realise that the whole chamber moves down to close the feed ports. I thought it had to touch the bottom part to activate it. Not only that, but I also thought it could get seeds from all the holes in the metal cage but I've seen that the seeds are actually in a plastic container inside the metal cage so the squirrel can't bypass the feedholes. This could actually work then!

Downside is, £23 for the mini seed feeder and £41 for the peanut feeder!

But I think it's a worthwhile investment. I'll start with just the mini seed feeder. I'm meant to hang it 18" away from anything the squirrel can hang onto so I'll probably need to buy an extended hook or hanger to screw onto the side of the bird table. But looking at my last photo above, I'm wondering if it'll work as it is now. I mean it's still grabbing the feeder which, if it was the squirrel buster, should close it.