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Here are the two types of the Loyd Motor Sickle.
I would have to say the earlier design (with vertical crankshaft)
is the better design.

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SOURCE: Grace's Guide http://www.gracesguide.co.uk/Vivian_Loyd_and_Co

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SOURCE: My Old Machine: http://myoldmachine.com/topic/481-the-vivian-loyd-motor-sickle/

TO BE CONTINUED ...