I have two Arri follow focuses on ebay: an Arri FF2 for true digital cinematography (cinema spacing for 15mm rods) heavy-duty and double sided with no play and perfect movement.
http://cgi.ebay.com/Arri-FF2-Follow...ultDomain_0&hash=item2a10e6fb00#ht_500wt_1156
Also, I have a light-weight follow focus which might be great for HDSLR it's 15mm but with the narrow 60mm spacing used on most HDSLR rigs.
http://cgi.ebay.com/Arri-Follow-Foc...ultDomain_0&hash=item2a10e7064e#ht_500wt_1156
http://cgi.ebay.com/Arri-FF2-Follow...ultDomain_0&hash=item2a10e6fb00#ht_500wt_1156
Also, I have a light-weight follow focus which might be great for HDSLR it's 15mm but with the narrow 60mm spacing used on most HDSLR rigs.
http://cgi.ebay.com/Arri-Follow-Foc...ultDomain_0&hash=item2a10e7064e#ht_500wt_1156