
There is a book on just Thimbles by Jean Hugard which is still available.
There must be some on the subject in one of lewis Ganson Routined Manipulation series. Alas I now only have the Finale one and they are not in that.
Supreme Magic put out one or two booklets on Thimbles; one was by Ken de Courcy
Try Magic Books By Post who purchased all Supreme stocks of books.
I believe Geoffrey Buckingham put material on one of his videos..now dvds i should think. BUT this is from the Top Of The Tree.
I well remember, as a 15 year old, asking the pianist to accompany my Thimble Routine with the Warsaw Concerto.

(still have the music..cued up too) He could only play the waltz, 'Over The Waves.' I then used this for several years afterwards.
Allen Tipton
Began magic at 9 in 1942. Joined Staffs M.S at 13. Nottm.Guild of M. (8 times President. Prog Director 20years)IBM. Awarded Magician of Month 1980 By Intern. Pres. IBM for reproducing Dante's Sim Sala Bim. Writes Dear Magician column for Abra. Mag.