506S - two 106mm diameter friction discs 506M - four 106mm diameter friction discs"
Finish (all models): Black enamel arms with 3 colour indicator disc.  Bolt, stars and locking rings are bright zinc finish.  Brass interleaving rings and wood friction discs in natural finish.

Special orders: Unequal arm lengths or arm lengths to special dimensions can be supplied to order at extra cost.  Measurements should be made from the centre of the indicator disc to the centre of each mounting bush.

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