After advice from members on several forums I managed to re-gauge theBemo 1260/1 Loco No. 81 ‘Wallis’ electric tunnel loco from 12mmH0m to 9mmH0e gauge. I thought therefore, as this information appears to be a well-hidden ‘secret’ that I would post how I did it.
2. Remove the wheel-sets making sure that you note which way they fit in the bogie and that you note which axles have traction tyres and on which side of the loco they fit.
3. You then need to make a press tool. As I was re-gauging from 12mm to 9mm I needed to bring each wheel in on its axle by 1.5mm. This is 0.0590551181102362″ Or as makes no difference 59 thousandths of an inch.
I therefore cemented 2 layers of 30 thou plasticard together using solvent (not cement) and drilled a 3mm diameter hole through them both when they had been stuck together. I then used my digital vernier callipers to check the combined thickness and this fortuitously came to 0.059″ i.e. 1.5mm exactly.
Sticking on a backing piece now gave me a hole with a known depth of 1.5mm.