People are actually using the solder type as a screw in type, because the screw in type does't screw down far enough to secure the wire. They work very good too. Here is a how-to someone posted in the customer review for the solder type: (misspellings and all)
How to use this banana plug as twist-in type.
Here are the steps.
1. Slit the cable to seperate the two (+ve and -ve) conductors.
2. Open the banana from its rear end. The one where the red or black color strip is.
3. Remove the sheath from the conductor about alength little more than the length of the end piece of babana.
4. Twist the strands together and insert them from rear of this piece (the one with color strip), till it comes out on other end.
5. Now you can untwist the end which has come out from other end and spread it a little bit.
6. Take the remaining piece of babana (almost the while piece) and screw in while pushing the wire forward from behind to ensure the wire does not come ot from behind while you twist).
7. Make it as tight as possible. The strnads which wre out are now jammed agains the twisted whole piece.
8. Give a little pull (not too hard) to the wire from behind to see that it is sitting and not loose.
9. Repeat the above for the other conductor with another banana on the same wire.
