Friends, Mark Ginter is getting ready to have some tone arms cast in brass (some originals were done in this metal) for the Columbia Kolster model 920. Off hand I don't know if it was used on other CK models. Most of them either have or are in the process of disintegrating as many pot metal castings do. If you are in need of one of these arms and or its base, please e-mail Mark directly ASAP and put Columbia Kolster in the subject heading. Mark can be reached at: msgtwins at comcast.net Replying to this message directly will only annoy those on the list who have NFI in the Columbia Kolsters. I don't know what the cost will be but I imagine the more who need one the better. Feel free to forward this notice to other phonograph collecting lists, bulletin boards and forums. Thanks, Ron L