As Se?n states above…
I have small toe in 
(Yep I did take the track differences into account…but only to allow for 0 to some toe in).
Having said that…I’m going to toe in a bit more as (like Mathew says) steering is ultra sensitive/too sensitive in a straight line at the moment 
Was in Dublin yesterday (80 + mile drive).
One thing you get froma n older car that you don’t froma modern one is greater feel for road conditions.
I coulf definitely feel ice on teh roads and slowed down appropriately.
All manner of car over took me at speed (I was doing 100km/h), including a few Garda? (Police). One of which was in a 4X4. More on that in a mo’…
But at one stage of the journey I hit a particularly bad spot on teh Moterway, I felt teh ice but obviously others did not…then to my surprise I could see teh traffic slow ahead.
A car had gone straight off at a gentle bend, was 30 metres into a field with the owner (thankfully unhurt) on his mobile calling for help…
The Garda 4X4 I saw later, quite obviously going in excess of the 120km/h limit barging cars out of its way. It caught up so quickly on traffic that the brakes had to be applied…some serious wobble, cars moved out of teh way and the 4X4 sped away…
I just can understand why there are so few accidents in these conditions…
What relevance does this have to the tracking thread?
Well, I have noticed with my ‘close to 0’ toe in that, as Mathew says, straight line driving takes a bit more concentrations as even a fraction of an inch of movement on the steering wheel steers the car off course.
But this lessens at higher speeds. So was much less noticable on teh slower drive in teh ice yesterday 
As to whether a Trakrite is a good Christmas present…sounds nice and cheep! At worst it could go on eBay if not useful!
I trust the string method more than one of the fancy computers in a garage. There was a time when a mechanic was skilled with cars and thei mechanica and engineering workings and set-up not just a a computer operator blindly following instructions on a screen!
Ah…I sound so old now 
Peter