So I recently purchased a nagauta shamisen, and it came with strings that appeared to be copper strings wrapped in a clear nylon or plastic coiling. The shamisen was already strung, but when I tried to tune my ichi no ito the itomaki would slip. So I got some peg dope, unstrung that string, applied peg dope, and tried to restring it. However, when I did this, the clear plastic coiling on the string broke, ruining the string. I used the replacement string, and the exact same thing happened.
Is this my fault, or are copper strings wrapped with plastic coiling poor quality strings?
And, do nagauta shamisen tune lower than tsugaru shamisen? Or do I just need to apply more pressure?
Thanks,
Nick