No lathe
Your tiller needs to be laminated (layered) to provide strenght. A solid tiller will snap very easily. If you have even minor wood working skills making your own will be simple. Use a large sheet of plywood to make a jig. Cover it with wax paper(this will keep the finished tiller from sticking to the jig base). Drill holes and place wooden pegs into the plywood in the size and shape you desire, don't glue them in just fit them in nice and tight. The wood you choose is up to you: teak, ash, mahogany, or if you want to be cheap and ugly exterior grade pressure treated lumber. Using alternating types of wood will create an attractive look and ensure your grain runs diffrent. You will need several strips about 1/4 inch thick (1/8 would be even better if possible). The length and width depends on how long and wide you want your tiller. Do a dry run first laying your srtips thru the jig with no adhesive, this will help you practice and get an idea how thick your final product will be. Bend the strips thru the jig on their thin side, add strip by strip with grains running opposite to each other until you have atleast 4 layers making the diameter of the tiller the way you want (6-8 layers of 1/8 is best). The base may need to be thicker than you desire in order to fit onto your rudder post, once you're done you can carve the rest down to the size you desire. Once you are happy and have a good feel for the process start over and use adhesive to make the final product. Use marine epoxy resin or polyester resin as your adhesive. A good marine shop, boatyard, or even lumber yard should be able to help you select a product available in your area. Roughly sand the broad sides of your strips where they will make contact then coat them with adhesive, glop it on, you can't use too much, and the excess will squeeze out any way, but don't worry about cleaning up yet. Then repeat your trial process. Once every thing is complete calmp it all together, lots of clamps, very tight. Allow your resin to cure and remove it from the jig (pegs and all) and clean up with sanders or grinders or what ever it takes to remove excess resin and grind the pegs off. Your finished product will be a big ugly square piece of wood in the general shape of a tiller that will be very strong. Now begin the process of sculpting your finished product. Use power sanders and planers to remove the rough edges then finish with hand sanding. Remember that the base of the tiller will need to remain square for some distance so it fits well into the goose neck at the top of your rudder post. This is a rough, quick guide but you should get the idea. Its a very simple process and in the end you will have something custom made to your personal size and shape, not to mention the pride of making it yourself. Varnish the daylights out of it, 20+ coats so it will be a real center piece on your boat, because you will always want to brag about it.Allen Wilsonsv No DestinationBiloxinodestinationsailor@hotmail.com