I played around with blind hems last night. Having never done them before, I’m not sure what the typical overhead for switching a serger into blind hem mode is, but “automatic” is probably a bit of an oversell. Assuming you already have the right number threaded, here’s the process:
Shorten the stitch length. If using the two-thread rolled hem, add the adapter to turn the lower looper into a spreader (pretty straightforward – the extra piece lives in the cloth plate compartment). This isn’t necessary for the three-thread rolled hem. Flip the stitch finger switch from S (serge?) to R (rolled?). There’s also a knob to change the stitch finger position – to be honest, I’m not sure what I was supposed to do with this knob, but it seemed to work fine regardless of where I’d set the knob. Adjust the tensions to the levels recommended in the manual. Then it’s just serge as normal.
Like I said, I’d never done this before. I tested both the two-thread and the three-thread rolled hem settings. Going from my default mode (4-thread mock stretch) to the two rolled hem settings (quick test sew for each), and back to 4-thread mode that worked as usual took maybe half an hour. Actually sewing the rolled hems was effortless. The two-thread version felt a little better (less stiff), but using the spreader made it a little more of a pain, and the three-thread version looked neater. That may have been operator error, though.
I hope this is helpful! I’ll post pictures of each, too.
