I used Vibroplex for about 40 years. I took 3" of 1/4" copper tubing and replaced weights with it.. Crimped it on. Then I wound large solder on a alligator clip. This could really slow down the dits. But I cud also send very fast with it by moving the alligator clip on the tubing. Looked terrible but sent very nice CW. 73 George/W2BPI