I have had some fine dealings with Leslie Gilmore of Belfast in Northern Ireland.He specialises in renovating servicing and repairs of MF. Folders,(Rangefinders or otherwise),and TLR's.
As there are few, if any, sources of this expertise in the UK ,I felt that I should share this contact.
Leslie operates an ebay site under the name 'Beedhams',with a huge 100% feedback,with a link to his website covering vintage Folders and TLR's.Well worth checking out.
Having dealt with Leslie twice in purchasing serviced and renovated Folders,I can recommend him in every way.
BTW. the Email address ---email@example.com