KD wrote:The VPI alignment tool aligns at only one point. Ano naman yon? Mabasa method?
On a seious note,
The two point alignment method generally assumes that the cantilever can be aligned at 2 tangent points on the record. The single point of vpi just makes it simpler by just doing away with the other point, with the assumption that it would still be tangent there. The 2nd point is actually still at some point of the record but vpi had assumed the user did it right at the 1st point.
For checking purposes due to sight error at the first point, the 2nd point is marked out as well. This is similar to other alignment tools such as the one I had uploaded in the analog section and the tool I use all the time, the DB Systems version. The DB system uses 121mm and 66mm points from the spindle as the "null" points or points of tangency. The Steve Rochlin protractor uses 127mm and 70mm distances from the spindle as the null points.
My geometry is a bit rusty and corroded but there must be reasons to this. I've noticed that pre mounted carts on headshells (ala ortofon and shure) for DJ tables/arms are aligned using the 127mm and 70mm distances as null points.
Any which way, modern teeny-tiny stylii today are more tolerant of tracking error unlike the huge stones of yore. Should your cart distort in the inner groove with more and more LP's, then it's a worn/damaged stylus. Time to shell out the big bucks again ... and again ...
MSM, sorry for the so many words and usage of your bandwidth.
rgds
Nhocty
PS: if your cart can't align at any of the points, however you do it, the guy who mounted the arm made a mistake. The arm pivot may be too far or too close to the record.
What alignment tool do you use for it
Kamag-anak nung nag ti-tweak ng mga Corvette. 
