65 bug converted to 12 volt problems

Anyone else having my problems? I converted my 65 bug to 12 volt years
ago and left the 6 volt starter in. About 7 years ago, I had to have my
flywheel replaced because the 6 volt starter had worn down the flywheel
teeth and it wouldn't always catch.
Now it's doing the same thing again. The starter doesn't engage the
flywheel the first time, often taking about 6-12 times before it
finally does.
What is the simpliest cure? Replace the flywheel again? Replacing the 6
volt starter with a 12 volt starter seems like a lot of work plus you
have to replace the starter too.
Any ideas? Thanks and could you answer me at my e-mail:
? Thanks, John(Napa, CA)