If it is just a bush, could you not make up a nylon one, using some rod, and a Dremel?
Even if you have to make another periodically, buy a metre of rod and you'd be set for life.
eg:
https://www.plastock.co.uk/products/nyl ... uUQAvD_BwE
If it is just a bush, could you not make up a nylon one, using some rod, and a Dremel?