A Localtalk to Ethernet bridge just gets a non-Ethernet device (IE Mac 512k) talking on the Ethernet LAN. In a sense, this is what I'm doing by having the 512 plugged into the PowerMac 6500 which has Ethernet.. It doesn't change that the fact that the two Macs (512 and iMac) speak a different network protocol when they use Appleshare. Hence, my solution posted above.

I wish the Mac 128k could use Appleshare, but alas, it cannot. It can print to an AppleTalk printer on a network, but no file sharing.