I've spent quite a bit of time on the J this week, but have struggled to get a smooth running chassis. The coupling rods bind for no obvious reason - despite all the usual remedies such as opening out the holes in the rods. I've also checked the wheels are correctly quartered, the chassis is square with all wheels touching the track etc etc.

After a few hours of this, I'm starting to suspect there's something fundamentally wrong with the rods., probably through my hamfisted assembly although I'm never keen on having the rods etched on a separate etch to the chassis.

The next step seems to be an order to Alan Gibson for a set of his etched coupling rods - I've always had success with these.