I have an older hosclaw trailer I've used for my 16' outchita boat. When I went to service the bearings there was no spindle washer behind the castle nut. If I add one the spindle nut threads stick out past the spindle,but I am still able to get a cotter key in the spindle to hold the castle nut. Did these trailers not originally come without a washer? The back of the spindle nut does have a slightly raised shoulder.