A very satisfying day.  In the morning Jim put some gloss black on some parts of the suspension so that we can assemble a complete unit.  Paul took advantage of a dry morning to square up the old underframe and reinforce it.  This was finally got to the point where it is only 0.5mm out of square.  I then got on with putting the remaining screws in the roof planks.  We put the underframe away when it started to rain but had got it reinforced.  After lunch I finished off the roof screws while Jim and Paul drilled and countersunk 16 screw holes into each of the drip rails. These were then masticed and finally screwed in place with 2" no 14's below the ventilator stripsd and above the windows..  The drip rails made a subtle but distinct chage to 107's appearance that makes it looks a little more like a tram every day.   The brake pull off springs are nearly ready and another research trip to Crich is being planned shortly to measure up various brake components ready for production drawings to be made.  All in all another good day at the office.