Hello Bonnar Bloke
If I can machine the bushes out 32mm nb pipe I would do ten for $120
posted. In the past I have turned them out of round bar, takes a long time on my lathe. They are quite time consuming as the bore has to be spot on for a nice fit on the bearing. I pay $9 for NSK bearings, you can buy ten Chinese bearings for $50 delivered on ebay (Australian seller). The Chinese bearings would probably last forever considering their application. If you are interested let me know and I will check out some pipe.If you want to see one that I have modified just let me know an easy way to post an image and I will give it a shot.