When using the idler wheel only, fix the brace on the axes of the two idler wheels in paratactic or in series and the top of brace has footplate axes.
单独使用滚轮时，可在并列或者前后串列的两个滚轮的转轴装上曲柄，曲柄顶端有踏板轴。
When using the idler wheel only, fix the brace on the axes of the two idler wheels in paratactic or in series and the top of brace has footplate axes.
单独使用滚轮时，可在并列或者前后串列的两个滚轮的转轴装上曲柄，曲柄顶端有踏板轴。
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