Cracked mast step/tube.

so in early august I bought a 75 sunfish from a guy down in CT, he didn't mention that the coaming was falling off, or that there was a crack in the mast step. What he did tell me was that it had been used at sailing schools since the spring of 2017 and that some knucklehead had crashed her into a dock and she had been hastily repaired and put
back to work. I know it needs to be fixed but how should i go about making the repairs?






.[ATTACH...

Cracked mast step/tube.