Travis Jordan wrote:
Fiberglass works best for most iron hex cores; plastic is an
acceptable substitute. Any 2-way radio shop in your town will have
hundreds of these tools and perhaps will give you one if you ask
nicely. Or for $10 buy a set of your own.

http://www.oselectronics.com/ose_p62.htm

Forgot to mention - you'll want to be sure to get a small steel blade
tip tool for those pesky little trimmer capacitors.

A GC Waldom # 8605 will do fine.