I am now only servicing instruments that I have made or supplied because I want to make time for building some new instruments, however, I am happy to recommend the following:

Andrew Wooderson, Bexley, Kent http://www.woodersonharpsichords.co.uk  

Andrew and Robert Durand, Surrey, http://www.musicroomworkshop.co.uk

Barrett Recorder Repairs (does some harpsichord work), Midlands, http://www.barrettrecorders.co.uk

Dan Tidhar, Cambridge Harpsichords, http://www.cambridge-baroque-labs.com

Other repairers are on my page: uk-harpsichord-makers-and-technicians.php

Replacing strings on tuning pins with no holes. Here is a scan of the Zuckermann kit manual 1976 and below that, a photo of the device I use for winding coils onto strings. Look at my blog page for further details. 

Metheod 2: Make a coil winding tool as shown. The oblong section can be made of wood. The pins are about 1mm and 2mm smaller than the diameter of your tuning pins. Wind a loop for the hitch-pin end of the string and cut the string about 20cm past the tuning pin hole. Put the string loop on your hitch-pin and pull gently, but firmly, as you make the coil as shown until the coil is above your tuning pin hole. (2nd item in picture). Remove the coil (3). Cut off the tail close to the end of the coil and insert end of tuning pin, tuning pin anti-clockwise to enlarge coil and allow the pin to work it's way into the coil (4). Set coil at correct height and put pin into wrest-plank. This system is particularly useful for putting on the thicker strings. It can be used for the thin strings too.

Here are two pictures from my Servicing trip to Cork and Dublin. It's not all hard work on these trips!

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