I can recommend the restorative treatment of Julian (and Bernadette) Kemp on a down-at-sparks CAV KU2, or lesser ignition provider: he supplies a detailed work/cost breakdown table, a three-year (at least!) guarantee, and is happy to reply to progress-enquiries from anxious customers during the restoration process (reckon on a 1-month turn-round: he's busy!). His charges are very fair.
Minimag is based on the Isle of Wight. Apply to sales@minimagneto.co.uk