One solution
First, to the best of my knowledge Seidelmann did not put rudder bearings in his boats. It's not an uncommon practice, many manufactures did not.To repair the wood tiller, open the crack with a putty knife or screw driver, pour epoxy in the crack. Remove the wedge & then clamp it till the epoxy dries. There are several alternatives for fixing the rudder slop. I am only going to mention the simplest. The other methods I have in mind might may be beyond your abilities and tools available, or get you in trouble if you don't know what you are doing. The method I suggest is to cut up plastic bottles ( like milk or shampoo bottles) and use them to shim the top and bottom of the rudder post. It is a quick and easy fix that should last a year or two before you need to replace the shims. In my boat I installed bearings. Considering the project took about 30 hours and about $ 100.00 I would not do it again. I heard about the shim trick from others that did it.