Alane0709 wrote:I will try to get more pictures to load tomorrow, it took me 30 min to get the one i loaded in the first post right and loaded
You are not alone when it comes to getting to pictures to load. You can do a search for helpful tips that others have posted, and here is a link to a thread that I started. Three key factors: pixel size, overall file size, and limit of 10 pictures per post. Recently some users found the limits stated in the post had been raised, but you can't go wrong with these limits. Any error message about why your pictures don't load is usually at the top of the screen and requires scrolling up to see it.
The rails that rpd referred to are actually the rails on the front and rear edge of the tables, that you don't have.
The 520 wasn't introduced until 1999 and only with type "C" headstock and the red safety key switch.
The way (upper) and bench (lower) tubes are the same for a 510 or a 520, and they to do tend to rust. Once you get the rust removed, Johnson Paste Waste will help keep them from re-rusting. Non-abrasive methods are best for removing the rust.
If you want to add tables, either the 510 or 520 style will work with your carriage. Be aware that there were two versions of the 510 table rails that differ in how they attach to the table. Be sure all are the same. And for adding other missing accessories, arbors for saw blades and for sanding disks for a 510/520 are longer than for a 500. Fences are specific to the 500, 510 or 520.