Sorry mate, it's long since been consigned to the dump as I moved house a few times since.
Basically a steel tie is a piece of flat steel of approx dimensions 200mm x 25mm x 1.5mm, so it's a bit like a blade.
We drilled a hole in the centre and got a piece of threadbar and bolted the tie to one end. (we used a few nuts to "locknut" it)
With the bucket, we drilled a hole in the centre of the lid and also in a piece of scrap timber.
Then we assembled the chopper as follows:
1. steel tie
2. bucket lid
3. scrap timber
4. drill
Then, you fill the bucket with apples, put the whole show on it and then run the drill while plunging it in and out through the apples.