Rajasthan Mechanical Works Ltd. Offers Adjustable Aperture Hole Seeding Attachment. Rajasthan Mechanical Works Ltd. Also offers tillers, disc ploughs etc. The Adjustable Aperture Hole Seeding Attachment is designed to use with all type of 9 tine tillers. Adjustable Aperture Hole Seeding Attachment sows seed by feeding from a hopper through are selected holes, via plastic tubes to boots fitted on the tiller tines. Clogging and bridging of seed is prevented by special rubber agitators mounted on a shaft driven by the ground wheel. The aperture of hole is adjustable by wheel provided at the side hopper.