Your new optic appears to be single mode (1310nm) but you say you’re using multi mode cable?
If your optic has a blue handle you should be using a yellow cable.
Obviously you can’t align with the record spinning and all you would have to do is move your cartridge slightly forward in the headshell if you wanted to account for the drag. The cantilever will deflect under the normal VTF load which other tools accurately capture and ddk estimates.
Ok, so if you think about it not only is this tool not “extremely precise”, it’s probably the least precise tool there is because it doesn’t align to the cantilever. I’m not aware of any other tool that takes the approach of aligning to the body.
Isn’t that .5mm to make up for no VTF load on...
A few flaws with the ddk tool which makes it not accurate. You use the tool to measure the distance from collet to stylus tip. This is done by inserting your cartridge into this tool. What you measure can vary depending on how you’re holding the tool and how you see it. Then you add .5mm to this...
“Extremely precise”… we probably have different definitions of that. Not saying you can’t get ok results but it is not a precise measuring tool. Anyone can see that.
I tried one of these, it’s ok if you want a quick basic tool. You will not get as precise alignment compared to SMARTractor or WallyTractor. I’ve probably tried most of the tools out there, I liked Wally the best. If you want one of these I’m sure @PeterA from American Sound can get you one.