Quote:
Tim Evans wrote:
Jeremy,it,s the shomenuchi ikkyo pin thats killing me my short arms make it impossible to pin with my back straight settled into the mat but I,m pressing on it will come I,m just keeping the faith.TIM 
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I think it's OK to lean forward from the hips (not be strictly vertical), just keep the extension through your arms, and don't collapse or bend at the waist. Of course, don't trust me on that, ask your sensei or sempai.
Here's some inspiration for you:
http://www.youtube.com/watch?v=bKz3sCr5V8M 