I received my Amazon knockoff of the Eastwood flaring tool, along with the appropriate 37 degree turret and flaring dies, and I am experimenting with some Nicopp tube before I start brake and fuel tubes for real. Specifically I am working with 1/4" Nicopp for the connection between the brake fluid reservoir and the master cylinders. So, the question is in the process. I use "OP0" to set the end of the tube flush to the front of the die, then go to "OP2" to do the single flare. I will get a bulge in the tube right in front of the die, and the flare is oversize if I stroke the handle all the way to stop. Has anyone else had this issue?
Also, the turret is marked "3/16-1/4" at OP2. If I fully stroke the handle with 3/16" tube it WAY overflares the tube, all the way out to where 1/4" is.

How do I know when to stop flaring the tube? Is it just eyeballed for single flares? Is "OP0" then "OP2" the proper process? The instructions only talk about doing double flares.

Thanks for any advice.