WHY can't i find the rear derailer for a huffy 21 powerline bike with "Shimano 7sis...

female

New member
...or 7...? ...515 decal on the mechanism??
on receipt my bike had the mechanism bent,skewed & hanging sans mtg bolt, i subbed a bolt to mount a used take-off mechanism-but it is too short stroke and will only properly move chain on rear wheel sprockets group- 3 which i am currently using--please assist if you have any knowledge of this unit mechanism
 
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