Hi markp27,
I just let them make there own threads. I find that this gives a better fit and keeps things tight.
As for the gap. I dont think it is anything to worry about. You will always get a gap at some point depending on how long you have the shocks set as the shaft can only go so far into the shock body.
I forgot to mention C-Clip pliers. THey are normally vital on most race cars.
As for my tools. I buy all my tool from a tradesmans wholesale store here. I got them from when I worked as a Spark.
I prefer to buy dearer brand tools like Snap-on or else I use Philips or Drapers. The Snap-on are expensive but come with life-time guarantee.
Another very useful tool is a Vernier guage for measuring tie-rods and pivot ball lengths. They make life a lot easier.