I received this product and it is built very well. It describes a maximum size stencil that it will accomodate but not the minimum size. I produce some very small boards and when I tried to adapt the stencil to it there were interferences such that I could not put the bottom clamp on the stencil. The wing nuts on the bottom hit the base. It actually appears that there are a limited number of sizes that WILL fit the SP2421. Should your stencil fit it is probably a very good product.
My stencil is 5" x 4" . It took me a long time to figure out how to place the stencil so the wing nuts would not hit the base. I finally had to give up and could only attach it from the top of the stencil . I really couldn't use it this way so it is virtually useless to me. If there were more gaps or deeper grooves in the metal on the base, one could probably strategically place the wing nuts to fit down in the gaps.
The construction is nice and very sound. I think you need to let customers know about this problem so they won't buy the product hoping any size stencil no greater than the size you specify will work, because they just won't due to this interference problem.
Maybe I am doing something wrong but I don't think so. Please correct me if I am wrong.
Response from Cybertronica Research | March 17, 2017
many thanks for your review, the feedback you provided is very valuable for us because it allows improving the product. You are right, there is a minimal lenght of the stencil, it is specified in the fist bullet point of the description: printing area: 245x210 mm (max stencil size 210x300 mm, minimal lenght 170 mm). There is a reason for this: small size stencils are difficult to mount, the mounting of PCB and stencil is less stable and the quality of printing is worser. Since the cost of