I have mastered the art of modifying an A series dizzy to fit in an A+. I have had all the necessary Drive dogs made up and know what needs to be machined. My experimental one was a 29D4. works well on an A+ now and even fitted it with electronic Kit.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

Hey, that's cool, but be sure to shorten the dissy shaft a tad, usually 30 thou get the job done.

Cheers

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Years ago (Maybe 15-ish years ago, when i was working for Macs Minis) we did many conversions for both directions,,, A-series dizzy into A+ donk ...& A+ dizzy into A-series donk

easy-peasy & there are quite a few different ways to achieve both results

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I fitted a Pulsar dizzy to a 1098, then later modified it for a 1275A+. Bushed the 3/16" shaft hole and slid the A+ dog on. Only other mod was to file a casting fin away so the A+ clamp fork would fit.
Too easy.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.