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This is my first post after a couple of years delving into the threads of this forum. First and foremost, I would like to express my gratitude and appreciation to this community for the great wealth of knowledge and expertise so generously shared for the benefit of everyone and especially members in need of assistance. I am located in Athens area, Greece and have recently bought a wide (6mm) zig-zag version of the PFAFF 138-6 in very good condition, complete with table and clutch motor, missing only the presser foot knee lifter assembly (my search for replacement parts proved so far unsuccessful). The full class designation details of the machine are 138-6/21 915/02-BS, meaning as per PFAFF coding system that she was configured from the factory for medium weight (B) fabric (S) and with part sets for cording & tween seams (915/2). As such she is fitted with an adjustable tween needle holder, part no. 91-064 652-91 (see attached dwg from parts manual and holder’s close-up photos for better illustration purposes). According to PFAFF’s manual (as explained also in another relevant thread of this forum) she is supposed to be used with 438KK system needles of sizes from 60 to 100 for the “B” type. SCHMETZ catalog indicates 265KK and DPx438KK as 438KK equivalent and differentiate them from the regular 265 and 438 as having shorter shank. Much of my confusion stems from the following contradictory facts: 1. The machine came with a rather faded sticker on her face cover plate indicating what appears to be 134RK system needle (see photo). . The machine came with an assortment of PFAFF system 134 needles of various sizes from 120 to 180 (see photo). Is PFAFF system 134RK the same as regular 134 ? Are 438KK and 134 needles interchangeable? They appear to have the same length of 33.9mm to the needle eye and same 2mm shank diameter. I am not sure about the role of the shank length though. 3. After thorough cleaning, oiling and adjustment of straight stich (“0” zig-zag width) position the machine appears to be sewing happily in all modes (straight & zig-zag) and full stitch range ( stitch lengths & zig-zag width) with the existing 134 needles and V69 thread. Apparently, needle bar length/hook timing has been adjusted for the dimensions of the 134 system needles. However, it appears that the needle is partly grabbed in holder’s center slot between the two L&R adjustable blocks rather than fully inserted in the split hole provided for this purpose (the resulting hole with the L&R blocks matting surfaces in contact is to small for the 2mm needles shank). This kind of needle mounting doesn’t look right from an engineering point of view and frankly speaking I don’t feel very comfortable operating the machine this way. 4. Since both 438KK and 134 system needles have a 2mm shank diameter, incompatible (oversized ?) with the existing smaller mounting holes of the needle holder, what needle system could be more suitable for use in a single (center line) or tween needle (L & R holes) configuration in this holder? Since its the first time I am dealing with a single bobbin- double needle configured machine I have no clue on how to proceed. My intentions are to use her for medium weight fabric and canvas/upholstery work , supplementary to my other two sewing machines (a compound feed Consew 226R and a cylinder arm Adler 69 ) . Any comment/advise on the above will be highly appreciated. Thanks in advance for any possible response.