Just to put the lid on my post. I ordered a 120 degree gear from CBS and it arrived next day. That has now replaced the 130 degree OEM and my issues have been totally solved without undue detriment to the general wipe area.
In case anyone does a similar job,CBS have an online video but here are additional tips: You’ll need to swing the coolant header tank up a few inches out of the way, to give room to manipulate the wiper box. The circlip was plain with no holes nor ears for a circlip pliers. ( I lost it twice as it pinged away) Having installed the new gear, when trying it before fitting blades, I noticed that it was parking to the left instead of the right. Although CBS mention the little white actuator on the back of the gear wheel for parking, they don’t tell you that it is reversible to the opposite side! (it came fitted for left parking) So had to start all over again and...lose the circlip once more! (this time landed virtually under the rear tyre..) So all’s well that ends well. I sincerely hope that my experience didn’t put anyone off buying these wipers. As others have said, they are really superb and all the commendations to Peter’s initiative are justly deserved. It was just my MOG that someone in the factory couldn't be arsed to do properly in the first place. I have found other things lacking symmetry. Yeah...it’s a genuine Morgan all right!
