yes DO NOT use the locking pin to hold the crank while tightening the bolts, use an air gun to remove and refit the bolts, then torque the bolt up after locking the flywheel either with a prybar or make yourself a tool to bolt across two of the starter bolts and lock against the ring gear like i have made
if you do not do the crank bolt tight enough it will come loose and wreck your engine
also as above do not use the cam locking bar to hold cams while loosening pulleys as you will snap the end of the cams use a 21or 22 mm spanner on the correct location of the cam to hold them