A writing instrument compressing device 20 comprising a base 21 having an underside mounted to multiple raiser pieces 29 to have the base separate from a carrying surface by a distance in a vertical direction. The base includes an elongate hole 211 that is delimited by two opposite sidewalls each including alternating tooth ridges and troughs 212,213. A handle rod 22 is pivoted to an end of the base to drive reciprocal movement of a pusher 24. A retainer 25 is reciprocally movable along the elongate hole of the base and has an upper 251 and a lower seat 252 with a holding plate 254 between them, the holding plate receiving two support posts 253 that support the upper and lower seats. The holding plate is movable along the support posts vertically, each support post having a spring 255 between the holding plate and the lower seat. The retainer is provided, on a bottom thereof, with a screw rod extending through the elongate hole of the base. A fastening member 27 is screwed into the upper seat and has an upper end forming rotary knob and a bolt extending downwards from it, the bolt being engageable with the holding plate. A tightening assembly 30 includes a nut and a rotation bar horizontally penetrating through the nut and having two ends selectively moved close to the nut.
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