In the '80's I bought one of those things that sounds like Rogers, but never had much luck with it.
Hi Dutch, When I first used mine I had oil pouring out of the bottom of the clamp and none down inside the cable. I gave up and made a cone with some card wrapped with tape followed by blu-tack. It worked to a certain extent but I remember it being a terrible sticky mess to take off afterwards.
The next time I wanted to oil my cables I looked at the (as I thought was another useless gadget) and then I noticed that the rubber piece inside the metal clamp was actually graduated for 3 different size cables. After fitting my cable in the part that fitted snugly I tightened the clamp and gave it another try . . . and then it worked perfectly.
So the first time I used it, with no instructions and in my ignorance, I tightened it with the cable in too large a cut out, so it wasn't clamping the cable tightly and the oil ran out the bottom.