I like the handles from Blackhawk Models, and they should still be available from Dave Gardner (check flying lines for contact info), or Boone's hobbies listed on the Blackhawk Models web site.
They are lighter than anything else I've tried, and can be easily thickened with Balsa laminations if you desire.
They also make a good reel for winding your lines on, and can be rubber banded to the wing, so you never need to re-adjust the lines once centered.
Bill