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I would have to agree with your comments regarding the lighting and would have preffered them to be dimmed during the presentations.
Very good pair of talks plus an entertaining Sky Notes. I got the distinct impression that both speakers gained some valuable feedback and insights from the questions and discussion at the end of their talks.
Do you mean the weight of the roof? If so, the two halves are not too heavy, they are constructed from folded angle iron and covered with thin plastic coated steel cladding sheet. When we moved into our house there was a ready made concrete base. The previous owner took the original shed with him. So I basically started building a new shed entirely out of metal.
Because of myself being a sheet metal worker I set about building my own roll off roof observatory from metal. Lack of space for the roll off caused me to make the roof in two halves. The outer half rolls onto the lower half and they both roll away. I felt that using castors, for example, on both halves would produce excessive gaps. So to keep the roof sections as low profile as possible I made two channels from 2mm thick galvanised steel, the sides about 12mm high and the inside width about 25mm. I then made eight blocks of metal that would run in the channel. They were drilled with a hole which would accept a steel ball bearing. The blocks were fixed to the corners of each roof. So basically the roof runs on captured steel ball bearings which produces minimal gap. Because the roof is an apex style and I have two runners on each side it can bind a little bit but a touch of grease can help. So far it has served me for many years without trouble. The channel shows little sign of wear but I recently changed the ball bearings which helped it run smoother.
Only 15 for me, I struggled with Instruments as well. A good set of balanced questions.