How is it broke? Actually a broken off peice, or is it just cracked? I've seen cracked main caps brazed up, and work just fine. In fact, #3 in my 235 was cracked, my machinist (over 50 years experience) brazed it up for me. He told me to used hardened washers under the bolt heads to help spread the load. Worked very well, although finding 9/16" hardened washers was a royal PITA.
