I have a used Selden Furlex that is coming off my T37. I had planned to keep it after new standing rigging installation but decided that I wanted a new system. This Furlex is from the mid-90's and has been rarely used. I personally took apart and cleaned both upper and lower unit down to the ball bearing. The swivels and the headfoil are in excellent condition. The reason I decided to replace it is that I wanted higher reliability for offshore sailing. The rigger had to remove the "rigging screw" assembly from the forestay wire. In doing so the "cone" was damaged and he said that he couldn't get a new one. So, a new rigging screw is required. This one on ebay for $200 might be the correct unit:
https://www.ebay.com/itm/402661143180?hash=item5dc079728c:g:k~cAAOSwppZgD7r7It would also need a new halyard fairlead for the top of the mast to keep the halyard from wrapping around the forestay.
I'm looking for a reasonable offer and local pick-up in Annapolis. This would be a great way to either refurbish a similar system or replace a failing one (new forestay would be required) for significantly less that the cost of a new system ($4-5,000). Pics forthcoming.