On Sunday, November 18, 2012 8:13:37 AM UTC-8, lynn wrote:
My PIK-20 trailer jockey wheel needs replacement but cannot find any commercially available units which will fit. The shaft size needs to be 40mm

In the US a "jockey wheel" is most often referred to as a trailer jack. I Googled "jockey wheel 40mm" and came up with this:

http://www.camperlands.co.uk/metal-j...mbly-40mm.html

good luck,

bumper