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Evidently the new BRM anglewinder chassis have issues in the area of being flat and true. Here is what Alan of 132 Slot Cars wrote to correct the problem:

"We have found for best Racing Results we need to straighten the BRM chassis, they are flat in regard to axles but when ejected from the injection molds it does bow the center of the chassis a little.
We pin down the chassis to a flat metal plate then place in a glass baking dish, we can do 2 chassis at a time this way.

Next one of two methods are used, if you have a kettle pour boiling water over the chassis until completely submerged and at least 1/4" over the top of all parts. Warm an oven to 275 degrees F then place the tray into the center of the oven and allow to sit for 15 minutes.
Turn off the oven and allow to cool overnight then remove, clean off the chassis and dry and you will have a flat BRM chassis.
Second method we have used if you do not have a kettle available pour hot tap water over the chassis till completely submerged plus at least 1/4" over all parts then place in an oven at 275 f for one hour, then turn off the oven and allow to cool over night.

Once done the chassis stay very flat, and it certainly makes the cars easier to set up.

We pay a lot of attention to the fact the cars sit on a tech block flat with all 4 tires touching, the fronts very lightly. Fine tuning can be done with the front axle adjuster, please pay attention to the position and adjustment of the grub screws and take caution to not over tighten as you can easily strip the threads on the uprights, metal grub screw, brass bushing and nylon chassis it is obvious that the first thing to strip or break will be the uprights.
We do not tighten the grub screw to clamp the front axle bushing leave a fraction of play and make sure the front axle turns freely.

Also if modifying the early Porsche cars the interior ears that rest on the front uprights of an inline chassis are ground off. Also we prefer to fit the latest guide with BRM guide spacers and you may need to lengthen the motor wires.

Hope this helps, questions please ask.

Die Cut weights are coming soon to tune the chassis, we find a minimum of 180 grams ( minimum legal BRM Challenge weight ) really helps, stock a Porsche will be about 160 grams.
If you run the Black motor then nearer 200 grams we find optimum, but every track, and driver will prefer a slightly different set up.

See you at the Races!!!!
__________________
Cheers

Alan"

You can read all the info and forum entries regarding this topic here on Slot Car Illustrated: http://www.slotcarillustrated.com/porta … post867098