I have Millermatic 135 and a older Lincoln SP-175T(homedepot model) and would like to adapt the M100 mig gun to the lincoln. Can someone provide me with a source for the the backend adaptor and or a part number? My LWS told me there was/is no such animal and told me to buy a new Tweco for $221 plus tax....lol I walked out thinking less of them than when I walked in..... Listed below is the model I have http://reviews.homedepot.com/1999/10...ws/reviews.htm