Q:

How to repair shifter housing

I have shifter with damaged housing.  It shifts well, but I guess if housing is not repaied, rain and elements will quickly put an end to it.  Which material would be suitable to fix this hole?  Epoxy glues?  Maybe ones with metal filler?  Are there some sensitive parts in the damaged area that I should be carefull not to glue? 

A:

Seems like you have two options.  I'm not sure this is your exact model but the broken piece should just unscrew. 

Unscrew what's left and epoxy it together apart from the internal workings. 
Buy a replacement cover.  I couldn't find any online shops selling replacement covers, but a call to Shimano* will probably net you the exact piece you need.  You'll need to know the model number which should be displayed somewhere and look like SL-xxxx.  I can't imagine a new one will be more than $20. 

*Shimano American Corp. (949) 951-5003

