With the gearbox in 5th gear and the plugs removed, how effective is using the rear wheel or a socket on the front spocket to rotate the engine crank into position for the valve clearance check? Can you easily position the cam drive gear so the line & dot line up between their respective cam markings?

After reassembling the valve train, is it necessary to rotate the engine a few times back to the check position then re-measure the clearance. Or can the measurement be taken once upon reassembly?

Jay