Hell I'd just go with a pk ring and shim
The best is Sixth Sense by Hugo Shelley.
Where can I get said books pleaseThe better know versions can be found in Rick Maue's Book of Haunted Magick, Jerome Finley's Thought Channel and Patrick Redford just put out a more in-depth companion to his Prevaricator that gives you alternative perspectives. I should note that Jerome's material include Byrn Reynold's brilliant thinking on the routine as well.
As a Mentalist I do my best to avoid gimmicks and more so, being reliant on gimmicks. I believe the leading obligation to this craft is being able to replicate anything a person sees me do on stage, at the drop of a hat. While that is a bit of a stretch with certain routines a good 85% of my traditional stage age can be done in just that manner and the other 15% I could probably replicate if I just thought things through a bit more (you can replicate all of it through Muscle Reading, Observational Skills, and using your vocabulary in a creative way)