Hi gr!
Sorry for delay, I was busy and can’t answer you. It’s not too difficult to make the ignition coil by yourself. So, what materials do we need: flyback transformer from old TV set with 12-15 inch screen (it’s enough, I mean the size of transformer), rod ferrite core. First we need to rebuild the flyback transformer and carefully take off the secondary winding as it is. It will be the secondary winding of our ignition coil. Put ~10 times winding on the rod ferrite core with the wire of ~1mm size: it will be primary core. The size of rod is not critical. Put the primary core in the secondary and clamp it. Don’t forget about good isolation between primary and the secondary windings. So put this all in epoxy and coil is ready! Only one limitation: epoxy is not so good isolation material and input HV tension must be not more 250V.
This pics is not my project, I tacked it from internet, but the idea is the same. Sorry for my English.
BR Iura.