LOL god memories, ok the average thumb nail is around 25thou thick easy to set your plug gaps!!
points? always did by eye as usually the shaft was always worn oval so it generally required a smaller gap to compensate, however usually set them with feeler gauges to start with,
timing? ignition on, set marks to static, loosen distributor and turn till the points spark, back very slightly and timing was spot on,
valve gaps? always done with engine running!! just tighten till they shut up do all stop engine use rule of eight etc, to check they all still have a little movement so wont burn out valves,
or the latest technolgy which was the spqr tappet adjuster, lol each click was equivalent to 1 thou so stting gaps was easy even though the valve gear was worn!!
fag papers were ideal for dropping the sump removing the big end bearingand mains, placing fag paper behind the bearing,put all back together, retorque and the rattling in the morning was cured for another 10k or so, used to be a hours job on the mk2 and 3 zodys!!! lol
carburettor setting? easy with gunsons colour tune to set the right mixture,
balancing them was also easy!!half inch bore pipe set just below the bellmouth, listen to it go to next and listen with practice you could get them spot on,
