Sometimes, when ya need a part that's hard to find, ya gotta make it yerself. I picked up this nifty little Speed-X model 510 bug via an eBay auction last week, *really* cheap (less than $27 including postage!). This one was made by Stewart Johnson sometime between 1934 and 1937 (he sold out to Les Logan in late '37). It was filthy-dirty, and it was missing the original dit contact assembly and adjustment screw and lock nut, these having been replaced by junky homemade substitutes. I was able to use an adjustment screw and lock nut from a Lionel J-36 (don't match the others, but work fine) and I made a better junky homemade dit contact assembly. Here's the bug after I cleaned it up and made my repairs. Cute li'l dickens, ain't it? Here's a close-up of my better junky homemade dit contact assembly: The brass part was cut from a huge threaded standoff. I drilled the center hole out to 5/32" to fit on the bug's swing arm. The screw hole is drilled and tapped to take a #4-40 machine screw. Soldered to the brass "core" is a modified leaf spring contact salvaged from an old Turner desk microphone. It only took about 1/2 hour to make the thing. Cheesy? Fer sure. Functional? Definitely! (And yes, once I was sure it would actually work, I cleaned off all of the solder flux!). Not a world-class repair, but it'll do until I can find the correct original parts. Have fun, y'all!