Heller drill bits.Used them on brass scratch builds and kits.
https://www.ebay.co.uk/itm/heller-quality-German-HSS-G-Micro-drill-bits-X10-various-sizes-super-jobber/391066988207?epid=1022978022&hash=item5b0d68aeaf:m:maVQcq6GzslTDCiDDGrz5sA
These will be worth a look.
www.ebay.co.uk/itm/0-00-009-N-Gauge-Servo-Brackets-Point-Control-Laser-Cut-Kits-x-10/122780575819?hash=item1c964ae84b:g:hFwAAOSw3v5Ynjx5
Another alternative servo mount
http://www.ebay.co.uk/itm/0-00-009-N-Gauge-Servo-Bracket-Point-turnout-Control-Laser-Cut-Kit-Peco-/122128749218?ssPageName=STRK:MESE:IT
I seem to remember, it was an electric floor mounted winchwith cables and pulleys?
I always went for a look in the 70's after a bit of train spotting at New street.