Thankyou Bryan, one of the previous owners have knackered the slot on the adjuster which I recut with the dremmel also the thread is non serviceable , so I was looking for some tips I have previously taken the cam cover off etc (holding rockers up with elastic bands when refitting) it’s just about taken the head off in the frame also the removal of the tensioner, armed with (6 sided sockets etc ) Clymer/Haynes , As you say will replace seals while I’m there , so new guide and blade do you think .( my bride (70) says I have no patience ONLY when messing with engines , must have been an Hgv syndrome 😜, thanks again ...