Buttonhole Attachment-Vintage Greist and Newer Industrial brand

I'm using two different buttonhole attachments with my Brother PQ1500SL straight stitch machine. One is a vintage Greist attachment that I had to modify to make it compatible with the center needle position. I enjoy collecting vintage sewing machines and attachments and trying the attachments out on different machines. The buttonhole attachments work on many straight-stitch-only machines to give them the ability to sew bar tacks or buttonholes. Be sure to check your machine's warranty and manual to see if this will work for you.