I´ve had my Seca since 1990. It has been a great daily driver. Last week out of the blue the front end started shimming on acceleration (even at 15-20 MPH). Rebuilt the front brakes but found out this isn´t the problem. Was then thinking steering head bearings or wheel bearings. After some basic push pull tests I´m not sure if this is it either. I haven´t seen signs that the fork oil is leaking, but can´t really rule anything out except the brakes. There are so many things it seems like it could be. Any advice on how to proceed for a do-it-yourselfer?