This tool can be bolted to the wheel studs on Early Post War cars and Silver Clouds to verify and/or adjust the perpendicularity of the brake shoe to the wheel flange using the extended pointer arm as a reference.  The triangle plate is zinc plated steel and the pointer is stainless.  The procedure is documented in the Factory Service Manual under Clouds, Section G, page 24:

http://rrtechnical.info/sc/sc1/wshop/7.pdf

SC EPW Brake Trammel RH627

SKU: BTW071
$100.00Price
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  • All British Tool Works tools are guaranteed for life.  No receipt necessary.  We will be astonished if one fails and we will ask plenty of questions, but it will be replaced post-haste or a refund given - your choice.  But honestly, that's not gonna happen.