IDD CI24 ECONO MM Penta 1.20 Galaxy II 1.2Mtr Polar MTG yes it has been on the arc for 25 years and is now fixed on 13 East using two pairs of rusty molegrips. Unlike me they never groan but always perform.
Have a look at the relevant forum, how can anyone answer such a broad based question in a short reply. In replying people are giving up their free time to help. Why should they repeat information that has already been discussed previously. The forum is there to be read by members then any problems or anything you do not understand you ask. Do the background reading first though.