Hello Grumpy,
Did the trick with the rattle gun, nut came straight off, slid spacer item 24 and recoil assy off end of crankshaft, removed 2 securing screws and bingo, ignition module removed.
The part number of the ignition module is 794-00008 which is diferrent to the ipb is 753-04463. The -00008 is also used in Ryobi and cadet vacs and MTD vacs as you said. The -04463 is available from Sears online store in USA, if I can't find one locally I will probably get it from them,
Thanks again, cheers Keith.