Okay,
Please do not flag this. Or remove the post. I do profit or benefit from this company sales.
Laser Experts may be able to help. I know they have at least one machine they have imported to your country and maybe they can get you a new cone also.
Cutting stainless: You can turn the sensor off by turning on the "trace off" light. (confusing, I know).
In the upper right corner of the cutting condition page is a parameter called "thickness". Make this value your material thickness, + nozzle gap, + 0.5mm. That will set the cutting height.
This may not be exact. You may have to adjust "thickness" higher or lower if the Z height is not calibrated correctly.
I do not know the material SAE1010 If it is steel, you can cut it the same as you cut stainless steel. If it is stainless, you have to post a picture so I can see what is happening.
Also, You can use the roller ball head. It should have come with the machine.