Didn't work that great for me. I think the PSI motive is to sell you more over-priced "adhesive pads" to go on your whip. You're basically getting $3 worth of emery paper for $16 at PSI.
I made one very similar to tridacna above with a rifle cleaning rod and some stainless cable. My difference is the cable was threaded into the hole in the rod and held securely by swaging it on both sides of the rod with the tool I use for crimping outrigger line with the aluminum crimps.
Don't get too wrapped up in the PSI inspection tools for sale. I needed their $195 torque wrench because, well, "everything else made is cheap junk and far inferior to the PSI torque wrench". I bought one from Harbor freight. With the coupon it was $12.
Then I was hanging out in the dive shops service shop and checked out his "PSI far superior to every torque wrench ever made". It was the same wrench made by the same chinese company in the same black plastic storage case with the same user pamphlet in 5 differenet languages and same warranty registration card going to the same place.
Now it's a good thing to support your cert. agency, but there comes a time (in my opinion) when the line is crossed and you become a victim VS a customer. I know Mark doesn't buy torque wrenches by the railcar load like HF does, but a 1600% markup is a little overboard.