Which two sided head are you using. I have been using the Topeak at many shops around the country. The nice thing is that you can order parts for it if you do break off the Schrader depressor you can fix it. They have one kit that contains multiple parts for all the pumps they manufacture.

If you have a great pump Topeak makes a hose kit that has seven adaptors for pump bases. I am not impressed with their smart head but the two sided head has be great.