So last year I bought an Adler 67 GK373. It has a sticker on the front declaring it is a Chandler. I found myself some manuals, cleaned it up, re-timed it, and replaced the clutch motor with a Nick-O Sew variable speed motor and a speed reducer. I sew leather holsters using 6-7 oz vegetable tanned leather. Usually the total thickness I am sewing is 1/4 inch. I use 138 thread top and bottom with 134-35 LR size 21 needle. I have not had any real problems with the exception of turning which I wil