shep wrote:
There must be something wrong with it then as the cable is loose in the hole even with the lock bolt done up
In the hole? Huh? There is a collar on the end of the cable that screws on to a male thread on the speedo cable outlet. The only part of the speedo cable that goes into any hole is the cable itself into a square drive.
Besides the O-ring on the on the outside of the Speedo Driven Gear housing (thats the large bush-thing that is retained with the lock bolt), there is alo a small oil seal on the inside of the housing for the shaft of the driven gear. It might be that that's causing your oil leak?