I need to upgrade a Leica Disto X310 device with an add-on PCB for underground surveying purposes. This is relatively simple operation, requiring a couple of tools (Torx) and precision soldering iron. The procedure is described in the attached PDF. I have all the components (Leica, PCB, batteries etc) I just need someone with hands-on experience with precision soldering to assemble the whole thing as I'm a bit concerned I will overheat/break it. This is UK-only job as I would need to send the parts to you and get it back over post. I cover all the postage costs. Local collection is also an option - I frequently drive between Reading and Redhill (M4, M25).