I don't think it was mentioned that Alan Clews bought the company back from Armstrong in September 1987 and CCM went back into production. Mike Eatough supplied Clews with frames starting from the time when the ex-works BSA frames were used up. Eatough later ended up working at Harley Davidson here in the USA. IIRC all the BSA tooling was destroyed in a big fire (possibly arson) that gutted the CCM factory. If you can find a copy "Rolling Thunder" by Bill Lawless tells the Clews/CCM story.
cheers,
Michael