You should also use the search: the linear turntable theory and practice has been discussed at great lengths on here already. In this thread, for example.
Read up on those TTs, then if you still have any questions, you can come at them from knowledge...
Welcome, allways good to have another Canuck in the mix. Do you have a linear tracker now or just concidering one? I have a Technics that I got for $5.00 from the Habitat for Humanity Restore. Needs to be cleaned and serviced but it did test to be working and tracking.