When I got my DS1 (#4480)last year I noticed a lot of sideways play in the centerboard. It would "clunk around" a lot. Found a number of references to the same problem on this discussion group and ways to fix it, which amounted to putting shims on either side of the centerboard. I did that and it's worked fine.
The purpose of this post is to mention the material I used--- 1/8" thick sheet of PVC type 1 "plastic". PVC= poly vinyl cloride (I think!). The same stuff that PVC piping is made from. It won't ever absorb any water. The local hardware store was able to order a sheet. 2'x4' sheet was about $25 if I remember right. That's plenty of material to make 2 shims, one for each side of the centerboard. Used a piece of cardboard to make a template of approximately the right size and hole location. Installed the shims without having to remove the centerboard, just supported it while having the handle out.
steve parsons (saabdrver-at-aol.com)