Theres quite a few versions of this tool on here, i'm not offering anything better, just that I designed one to suit screws that I had laying around.
For this design I used 2 x M4x0.7 screws with 25mm long thread. The thread holes are 21mm long leaving 4mm exposed which is what I found the depth of the recesses to be.
If you would like a version using a different length screw, leave a comment i'd be happy to accomodate.
EDIT:
I originally designed this to be a universal tool but measured it from a Mancraft cylinder head and I’ve since found it to differ slightly from the other heads I have.
I am going to design another based on a stock TM cylinder head or comparative aftermarket part and post it as a separate file. I am also going to find and use better screws for that build.
VSR10_Cylinder_Head_Tool.stl | 1.4MB |