rectifier of saddles
From chapter 10 of the Tale of a Tub

Alluding to what his opponents deemed the useless pedantry of Bentley, in correcting common errors as to the authorship of the letters ascribed to Phalaris, and similar forgeries. The phrase is, no doubt, meant to ridicule the uncouth and familiar style in which Bentley often indulged, although I have not found in the Dissertation this special expression. The roughness of his style is so marked that Boyle asserts that it will some day be used as a proof that the Dissertation is a forgery, not being written in the English tongue, or by an educated man.