Sorry to disagree MartynG but one does not have to remove the seat. Removing the front bolt only allows the seat to move rearwards (assuming standard ‘B’/’C’ fitting) and provided that the spring boxes and rear mudguard are protected with a piece of thick cloth (folded towel) then no damage will occur. Removal, and replacement, of the tank is a pig and in my opinion the tank fixing is one of the worst pieces of design on a Vincent. It is true that if one drops the plot and it goes bouncing down the road the tank will stay in place but compared with either strap fixing or one bolt fixing as used on some other bikes of the era it is not easy for a first timer. Removal is bad enough with having to get at the quarter inch nuts, and the tube, under the rear of the tank but replacement of both the two front stepped bolts and the rear tube, and stud, below the tank rear is tricky. Kurtflys seems to be on the steep part of the learning curve and my recommendation is to do it with plenty of time and patience at hand. Lubricate the two front stepped bolts and their rubbers at the front and make sure that they can be screwed in with fingers and a tube spanner a few turns before using force as it is all too easy to cross these threads. The rear tube and stud is just a matter of patience but for a first timer it is tricky to ensure that the tube is in square (I file a slight ramp onto less than half of one diameter at one end of the tube to ensure that it can be started without having to force it) and one has to ensure that the rear mounting rubbers are thick enough so that the tube clears the rear valve spring cap. For those who have done it many times before and know what has to be done it is just a matter of patience but for a first timer it is not an easy job.