I'm currently prepping a 235 for an engine swap. I looked through my old tool bucket and found a 1/2 inch drive 3/4 inch socket that was a good fit inside the front of the harmonic balancer. I used a dremel wheel to cut a lengthwise groove on the outside of the socket and welded a piece of 3/16 key stock in the groove. After a little work with a file the improvised tool works great. Once the engine is installed I can use a long 1/2 inch drive extension to access the harmonic balancer through the old hand crank access in the front grill.
