When re-attaching the shifter to the linkage with the long bolt, there may be some difficulty getting the base of the shifter, with the new bushings, seated between the arms of the linkage. To make this part easier, I inserted a pair of pliers between those arms and stretched them out a bit.
I also taught Masters Students at Imperial for 3 years. The molecular formula for cyclohexane is C6H12, therefore one molecule of cyclohexane contains 6 carbon atoms and 12 hydrogen atoms. The relative atomic mass (RAM) of carbon is 12.011 g/mol. For hydrogen the RAM is 1.008 g/mol. Cyclohexane's molar mass is thus: (6 x 12.011) + (12 x 1.008) = 84.162 g/mol.
For example, if you are told that you have 5.00 moles of carbon, then write down 5.00 moles. If you are told that the density of water is 1.00 g/mL, and that you have 4.00 mL of water, then write this down. Find the molar mass of the compound. The molar mass of a compound is how many grams of the compound are in one mole of the compound. This information is in the periodic table. 12.00 g/mol. You do not need to find the molar mass of the water because you already have the density and the volume, and multiplied together, that gives you the mass.