Thanks, Therapy, several times. What I did was measure the diameter of the rubber seal of the original dipstick that seats down inside the Yanmar's dipstick tube. Then I measured the width of the blade of the Chevy short block dipstick replacement. I found a short length of copper tubing that would both fit inside the dipstick orifice, and accomodate the actual new dipstick. Then I decided where I wanted the handle. Measuring the distance from the oil
orifice to the desired height of the handle base, I added the actual engine dipstick length to that extension measurement, marked it on the new, out of the package, dipstick from the bottom end of the knob (where it seats on the top of the copper tubing), and cut the dipstick to this length. Then I marked, on the new dipstick, at the bottom, the exact oil level marks of the original. Lastly, I measured how far I could insert the copper tube before it felt securely seated. I added the seating length to the extension length to get the sum for the copper tube. I cut the tube to the right length, inserted it into the oil orifice, slipped the new dipstick all the way to the top of the copper tube and compared the oil level on the new dipstick with the level obtained from the original. Exactly, the same. One of these days I should get around to making a top support bracket for the copper tube extension. At the moment, it feels pretty secure, though. I hope that was clear enough.