Manual 34-10 after not able to squeeze the ltch shft as instructed to get friction on the rotation of the canopy latch handle I decided to use two plastic washers on the bottom portion of the latch handle inside the fuselage. I could have used two of the C-671 washers called out for the top of the latch but did not have them. So used two 3/8 ID plastic washers and drilled them to 1/2" to fit over the shaft. This worked perfectly. Had to clamp the handle down a bit to allow handle screw to insert properly but when done it works very well. Nice even friction. Added grease for corrosion and waterproofing per the instructions.