Siman 488

(45.) Kaf kela [the sling] in gematria equals shin shanah [a year of wandering] — which was the situation of the bridegroom who wandered from house to house and from city to city etc. And I heard that this story was told in the name of the elder tzaddikim — it seems he told it in the name of the holy Rabbi, our teacher the Rabbi Yaakov Yosef of blessed memory, the Maggid-Meisharim of the holy community of Ostra.