Hi – I am interested in the article on an Improved Black Five Regulator published in recent issues of the ME but have only been able to obtain a copy of No.4648 from the ME Back Issues department. Part 3 is described in ME 4648 with Part 2 in 4646 but I have not establised the issue relating to Part 1. Can anybody help me locate copies of the two MEs describing Parts 1 and 2?