The guys at bmx-onlineshop.de have developed chaintugs that also work on forward-facing drops. The description is in german, but I have mailed them in english before and they are more than willing to help. So if you have questions, just mail them.
http://www.bmx-onlineshop.de/d_36009_ssp_Singlespeedshop_Chain_Tugs___Kettenspanner.htm
(Just to be perfectly clear: I have no connection to them, having seen this chaitug on their page I thought it was revelvant to post it)
@dogmatic started
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The guys at bmx-onlineshop.de have developed chaintugs that also work on forward-facing drops. The description is in german, but I have mailed them in english before and they are more than willing to help. So if you have questions, just mail them.
http://www.bmx-onlineshop.de/d_36009_ssp_Singlespeedshop_Chain_Tugs___Kettenspanner.htm
(Just to be perfectly clear: I have no connection to them, having seen this chaitug on their page I thought it was revelvant to post it)