The best machine out there is a Claes. These are very expensive new. Used ones are available but they start about $3,500.00 just so you know. I would try to buy one of them.
glenn
Model 313 Pederson. early model. They came out with other models later . The 317 is the Rapid E. Considered the Cadillac of curved needle sole stitches. These machines all made in Denmark.
glenn
The length of stitch should NOT effect the tension. If the needle hole is too small, that will affect the stitch tension because knot will get hung up on the bottom of the piece you are sewing.
glenn
Check with Kwok Hing and order feet for them. They are in Hong Kong and ship the States. Very good quality. You buy genuine Pfaff, they will not be chea.
glenn
Contact Bob Kovar at Toledo Sewing for needles. Best thread to use on it is #69 and #92. i have bobbin and genuine Simanco hooks and generic for sale. I also have the books on the 29U171A for the machine. I charge for them just so you know.
glenn
Claes does make a single toe foot. Contact Claes in Germany. They can give you the name of a dealer either in the UK or Germany. You can also take and existing foot and grind one toe off.
glenn
Best machine of the 3. I owned one. Smoother running than either Adler or Singer. You did good. Greased Lighting is great for cleaning up machines
glenn
I found someone in NC here in the states that has two of the assemblies but he is swamped until early January. Get me an emails so I can put you in contact with him.
glenn