You can find good gauges here: http://www.vinylengine.com/cartridge-alignment-protractors.shtml
Stevenson is pretty good with the Dual. These you do have to be careful with when printing so that it does not get resized by the printer settings.
Dual had their own specific plastic gauges but Stevenson is very close to that. I don't remember off hand the measurement from the end of the sled but that's one way as well.
Here's a Dual gauge on a TK20 sled for a 1019. It's not the same as the 12xx ones but similar.
Dual TK12 Alignment Gauge by Buhduh, on Flickr
Stevenson is pretty good with the Dual. These you do have to be careful with when printing so that it does not get resized by the printer settings.
Dual had their own specific plastic gauges but Stevenson is very close to that. I don't remember off hand the measurement from the end of the sled but that's one way as well.
Here's a Dual gauge on a TK20 sled for a 1019. It's not the same as the 12xx ones but similar.
Dual TK12 Alignment Gauge by Buhduh, on Flickr