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Bellows Linkage
I made the bellows linkage from 1/2" square section tube from B&Q, cut
to the dimensions shown in the sketch.
Any size bolt around 6mm can be used with a locknut attached. It is
best to drill the hole for the bolt before cutting the steel. Leave
a 4mm ridge on the bellows end to strengthen the fixture. The con rods
can be made a little bigger to allow for the bolt. |
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Spool Fixing
A Meccano Bush Wheel is ideal for fixing the take-up spool, and the spool
wheel, on the shaft. Drill the boss out very carefully to 6mm. |
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