Originally Posted by pommie john
I use a spark plug with the centre electrode smashed out and a bit of rod welded in there. It's maybe 40mm long and although it's not getting positive stop right at mid stroke, it has proved accurate and repeatable, so I'm happy with it.
That's exactly how I would get there too but the engine I want to use is already apart. Mid stroke isn't the important part. Getting away from TDC is! I want to leave the rocker arms out of it at least until I am a bit more familiar with how they usually time although they probably won't make that much of a difference. You never really know until you try it I guess.