Mekanic

It's "consistent"...adds an additional stitch. Raises needle to UP when pedal is back-tapped. I'm still learning/tweaking setup.

Toledo Industrial Sewing Machines: Speed Reducer (4:1) GoldStar Tool : 750w Servo MasterPro Belt: 7330 (15330) 3/8" x 33-3/4" OC Speed is VERY controllable at stitch...added Needle Synchronizer also.

I suspect my issue is with "using the wrong needle"....135 x17...rather than 135 x16...The option is being mailed this week.

I was "gifted" with a JUKI LU-563 (14 years sitting in a barn)...I've SUBSCRIBED to everyone with even remotely "135x17" systems...dumped the "clutch"...750W Servo and Speed Reducer (Toledo Hardware) added. Mechanically...I can fix most things...so far so good. Lot of "Industrial Thread" (for free)....and a can of Sewing Machine Oil since the Juki was "locked up". Been lurking on Leatherworker...and found very helpful information/comments and discussions as a GUEST and eventually a member....From some VERY Technical people!

"Straight" stitch working with same tension setting as "Reverse". Straight stitch appears normal with topstitch, and bobbin side appears normal. When I perform "Reverse" stitch the (large) thread "twists" into a tiny knot with the bobbin thread making a little "nub" at each reverse stitch. Both threads are "left hand". Juki LU-563 Heavy Leather (0.175) #24 Needle TopStitch Thread (135?) Bobbin (75?) I'm definitely "outta-my-league" here...SmartPhone pics say "Max size exceeded"?