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The tensioning “spring” will be 6mm diameter bungee cord clamped to the tensioner plate where the two 6mm bolts attach the support plate. The 6mm bungee cord will be looped round an aluminium “cotton reel” attached to the swinging arm where the standard nylon swinging arm/ chain protector is bolted on. I chose bungee cord because being rubber it has natural damping although exposed to the elements it might need changing fairly frequently. The clamp fixing should enable me to easily adjust the tension.
Obviously I do not know if it will work. I will let you all know sometime next year.
Today’s tasks are to a) make the bungee clamp arrangement on the tensioner blade; b) turn up the “cotton reel” for the upper from 25mm dia aluminium bar; c) get rid of all the filing marks and polish the plates; d) drill and tap the bearing support and attach it to the tensioner blade.
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