VF1000F head bolts and starter idler shaft.advice wanted

Hi another couple of questions on my vf1000 i want to replace the outer cylinder head bolt,would it be safe to replace them one at a time,also the starter idler gear shaft,mine needs replacing,the one fitted is hollow is it an oilway or can i turn up a solid one,where the shaft goes into the crankcase there does not appear to be any oil ways and oviousley just goes into a blind hole in the clutch cover,just want to make sure before i turn one up.