Having been let down by ANOTHER sandblaster one time too many, the best option to ensure the job gets done properly.....or done at all, is to do it yourself.
Crude but moderately effective, with over 75% of used sand being collected for recycling.
The rest went into surrounding ground, and into my pockets......apparently.
I'm yet to finish the pull rod for the ratchet, and make the adjustable fitting that attaches upper end to the silver lever. Something like on the ends of the CMP brake rods should do nicely, if I can modify it.