Minivin, Not wanting to "Teach my grandmother to suck eggs" but just make sure that PD5 engages properly onto the splines of PD4 otherwise PD7 will not screw down fully,this has happened on my comet at some time in the distant past. I know this because I can see to scour marks on the inside of the primary chaincase where PD7 has made contact.
Hooterman (Tone)
Minivin, My attempt with a new Comet E215, E216 and PD3/3, PD5/2, PD4/2, PD35, PD7/2 plus springs of course and it would not fit under the chaincase cover.