Ok Maplin

1 high power toggle switch DPDT Momentary Code N41KR £3.59
1 MFA/como Drills motor 457RE360ME £5.99
2 30mm v pulleys () 6 for £1.99
1 box £4.99
1 dc power adapter mines 9v(I had that already though)

Some Nylon string I bought 100m roll
some small cup hooks

the carriage is aluminium £4.99 but is enough to do 5 or 6
the target holder wire is a metal coat hanger

And thats it.

Happy playing