Question about harmonic balancer on a 250

[slaminum69]

I do apologize in advance on this question, I know there has been other posts in regards to it but I just want to make sure. On a 250 engine when mounting the harmonic balancer is there suppose to be a retaining bolt at the end of the crankshaft? I heard yes and no, so i want to make sure, I know when I got the motor there wasn't one on there, looked at others and the same but then some do. I looked at the crankshaft seems as the previous owner tried to tap one in and failed. Just want to make sure I am not missing something here don't want this balancer flying off when I am down the road, That would be a site to see, lol. I know every other engine I have worked on has had a retaining bolt for that purpose and hand cranking the engine, so anyways I would like to get some inputs from you guys Many Thanks