I followed your link and the pictures of the 2285 are pretty accurate of how my 2270 is strung. However the diagram posted does not seem to match the pictures. I suspect your 2230 is similar to my 2270.
I understand your frustration so let's look closely at the pictures (not the diagram) in that link you posted and I will try to help.
I will make an assumption and say the string is still intact and still wrapped around the large tuning wheel on the front of the receiver as shown in Picture 1, but is off of the smaller tuning wheel with the spring show in the middle of Picture 3.
Look at Picture 1. Just to the right of the large tuning wheel is a piece held by 2 screws that has a plastic roller guide wheel on the bottom of it to guide the string. Remove one of the two screws and loosen the other screw so this whole piece can swivel. This will allow you some slack in the string when you do the final stringing. You will swivel this piece back into position and replace the screw to take up the slack and tighten the string when you are done.
Make sure the pointer is on and kind of centered in the dial for a reference point. Loosely run the string generally as shown in pictures 1, 2, 3, starting at the tuning needle. You do not have to wrap the string around the smaller wheel with the spring yet. Loosely tape the string into position to hold it on the plastic guides or wherever else it is needed as you go. Don’t get carried away with the tape because you will be moving the string position as you go. I use the blue painter’s masking tape because I have it and it goes on and off easily, but use whatever you have. Just use common sense and don’t put it where you don’t want residue like on the dial face.
Look at Picture 3. Look for the spring in the middle of the smaller tuning wheel show in the middle of Picture 3. The spring should be attached to the wheel on one end and loose (not attached) on the other Now take a look at the string you have left near the wheel with the spring. Can you see any subtle signs (a kink or bend) where it may have been hooked to the spring before? If you can that is good. You will use that same spot in the string to attach to the spring and later when you are finished the pointer should be close to matching the numbers on the dial to your favorite stations. Now hook the string (don’t wrap it) to the eye of spring on the loose end, run it up to through the notch on the wheel, and wrap each part of the string in opposite directions like it is shown in Picture 3. You may have to rotate the wheel and / or move the pointer so you have enough string on each side to allow the pointer to travel the length of the dial in both directions. There is some trial and error here. It may take several tries. Remember that original kink in the string is a good reference point.
Now double check the path and see if it resembles Pictures 1, 2, 3.
If it looks good go ahead and swivel the piece with the guide wheel back into position and replace the screw (snug them, don’t torque yet.). This should take up the slack and the string should be fairly tight when you are done.
Test it first my gently moving the large turning wheel. See if everything moves freely. If it does not move, binds, or slips, double check your setup with the pictures. Also check where the string is wrapped on the brass part of the large tuning wheel you see in Picture 1. Some models may have a different place where they wrap.
Hopefully you have had success. Before you button it up turn it on (using usual safety precautions) and see if the tuning needle matches your favorite stations. Also make sure the pointer has enough travels on the dial.
If not, note where the pointer is and where you want it to be. Add some tape again. Loosen the string again by pivoting that piece again. Now move the needle to the correct position. Hopefully you do not have to move it too far and you have enough slack in the string. Tape the needle in the correct position fairly tight this time. This is now your reference point. The string now has more slack on one side than the other. Move the position of string till it is equal on both sides of the needle. You can pivot that piece to tighten it up to check your fit as you go. Don’t forger to tighten and clean everything when you are done.
This is trial and error so your mileage may vary on the PITA factor to do this.
It may not be the best way but it is the way I have done it and had success on several occasions. Good luck. If you get frustrated, set it aside and try again later, or let us know what is happening.
Jim