Soldering would be the best, sorry to have not mentioned that. However from the sound of the original post I was addressing the ease of repair and crimp spicing is a great choice. It did not sound like you had the necessary tools and supplies to do the more difficult solder joint. I've been an electrician for 16 years, soldered electrical wiring joints went away about 20 years ago except for circuit board repairs. /We've had great success with butt spices on low voltage systems which include fire alarm, security, access control, nurse call systems, etc. If you have the ability to solder, do it, if not don't be afraid of a butt splice, just take the advice of the other reply's here and don't leave any bare wire unprotected.

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Chris Rogers