Setting timing without pointer
Basically you use a piston stop.
Rotate the engine clockwise until you hit the stop.
Mark the balancer.
Rotate the engine counterclock wise until you hit the stop.
Mark the balancer.
1/2 between the marks is TDC.
Caution: rotate the engine slowly to not damage the pistons, also having all the spark plugs out makes it roll easier.
Good luck