... ( nut and bolt). But it's also true I haven't built a conventional switch in years and so I'm not really familiar with how flexible fixed heel blades can be? Am I worrying unnecessarily? In any case which is the correct approach for the slip switches, fixed or loose heel? This is the complete slip with ordinary chairs and slide chairs marked along with the extra support rails as well. In the photo I've forgotten to extend the centre timber onto which I'll need to build some semblance of the reverse crank. 2787_170545_330000000.jpg Kind regards Andrew posted: 17 Aug 2019 11:48 from: Martin Wynne Hi Andrew, Page 57 says all slip switches in GWR compounds (GWR-speak for slips) were old-type loose-heel switches (hinged). So if you happy building such, I would go ahead and do the same. However, page 55 says the moving K-crossing switches (movable elbows) were long flexible switches. I see you have marked them to be hinged. I think they would be sufficiently flexible ...