Dear Cond;
Yes a large heavy hammer.
Just make sure the shaft/hole inside it are clean with a little oil etc. Start it on by hand lining up the keyway & tap gently till it starts on. Then "wack it good" till it hits the timing gear.
You can't chrome it because they are two pieces held together by vulcanized rubber and the chemicals involved would destroy that bond.
Good luck, John M....
