Hi,
If I have a bad nail or sore finger, I simply use one of my handmade picks.The thimble picks I use are all plastic (for the tone I want) and designed for rigorous clawhammer or other styles of picking. I ended up making my own.
I made some extras. Those of you interested can purchase them here:
http://users.eastlink.ca/~harleyspi/fingerpicks.html
I know some of you are using a Brass thimble. What do you think of Plastic finger picks? Willing to experiment?
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Harley Spirit