I prepared to use what was to hand; a tennis ball and some bolts and brackets.
The trained monkey following a banana on a stick will come later.
Step 1: Step 1
A tennis ball
A 6mm nut and bolt
A strong strip of metal (this is a stabiliser bracket)
A bolt long enough to go through a tennis ball and two nuts (I used a 10mm bolt)
Step 2: Step 2
Step 3: Step 3
I used an 8mm drill.
Step 4: Step 4
I heated up a spoke and cleaned the hole up by melting the rough edges away.
Instead of any drilling I imagine that a soldering Iron could be used but it would smell a bit.
Step 5: Step 5
The nuts are tightened against the bracket and act as locking nuts, allowing the ball to still spin freely.
The excess bolt is then cut off and the burr filed down.
Step 6: Step 6
I fixed the whole ball assembly to this hole; the bracket was pre-bent to rest against the wheel with sufficient pressure to turn with the wheel.
Step 7: Step 7
For general meadow and wasteland areas-
For woodlands and along hedges-
Nettle leaved bell flower
These have to be funneled in through one of the holes; my funnel end was too big so I attached a Bic pen lid.
Step 8: Step 8
This is the spreader in action.
It does work well but is difficult to catch on camera.
Thank you for ploughing through the instructable his far. . . you can stomach it, please carry on for the bonus material.
Step 9: Bonus Instructable Step 1
Step 10: Bonus Instructable Step 2
I tried a cardboard cowl; that didn't really work either.
Step 11: Bonus Instructable Step 3
Step 12: Bonus Instructable Step 4
They do not show up very well on camera but there is a followable trail so use you imagination.
I suspect it will work better with white chalk which I will be trying soon; and maybe enlarging the holes.
Anyhoo have fun and please do not forget to vote if you have enjoyed this instructable.