[bobbydirl]

1. Thanks EZRA and John. I used Ezra's idea with the grease around the piston's edge with success. I found a scratch on #2 wall all the way up and down that will not catch my finger nail (probably from an ancient piece of trash, ..I plan to ignore it). Instead of W-D in Ezra's method, I used ECR assembly grease and lithium spray can grease to catch trash and lubricate walls. I also cheated with some gentle razor blade, and brake cleaner and teflon coated fine steel wool action.
2. I found out how the coolant was getting to the base of the oil filter mounting spot. When I rotated the crank to get to cylinders 2 & 3, it magically appeared, I assume from the oil pump. I wonder how I can get it out now short of rotating the engine with the starter to cause the oil pump to turn?
3. I don't have a 24mm thin wrench to get the oil pressure sender off (Clark's said I have to remove it before removing the oil cooler). I can't believe a city of 1/2 million could only produce one for sale at Ace Hardware for $15. I have a 15/16" but it is too wide to fit. Does it have to come off first?