I sent my Optolyth draw telescope off to Glasgow Binocular Repair for a service and clean. While it was with them they spotted some problem with the prism and so we decided to replace it as well. Despite having to send to Germany for the parts the scope arrived back with me yesterday after less than 3 weeks. It now looks, works and produces an image like a new scope and in my view the cost was very reasonable indeed.
If you have a draw scope such as the Optolyth that needs work or is getting a little dirty inside then I can recommend the good folks in Glasgow, if you get it off to them now it should be back before the season starts. It also gives some confidence if you are buying from ebay or similar that most faults and problems can be fixed allowing you to buy into good optics at a fraction of the cost of buying a new scope..
I have no connection with them other than that they did a good job on my scope and I thought this info might be useful to others, contact details are:
Glasgow Binocular Repairs
93 Hope Street