I'm offering a WM20 speedo for sale for US$150. It does not work, but the problem is straightforward and may be repairable at home. One shaft, which I indicate in a photo, does not turn its output gear.
I am in Rhode Island, USA, and the parcel will weigh just over 1 LB. Shipping charge to your location can be calculated on USPS.com.
10% of the sale price will go to Henk for expenses.