In good condition, a DAR 2" double helical focuser for dobs and newtonians. Made from aluminum and bronze, the outer helical is 5 threads/inch while the inner is 20 threads/inch. Minimum height: 1.6" above tube, max: 3.9". Helical motion is very smooth. Comes with 1.25" adapter, 10-24 socket head cap screws (4). Base is made for 10" OTA or larger. Weight: approx 15 Oz.
A new one retails at O'Neil photo at $210 CDN. Will sell for $100 obo CDN (or $80 US), including shipping. Postal money order preferred or plain cash will do, too.
Thanks for looking,