The manfrotto 125 is an adapter spigot which features a 3 8 inch thread on each end.
Price: £11.95
This universal short 16 mm spigot with double male threads one 1 4'' and the other 3 8''.
Price: £10.95
The manfrotto 163 10 adapter converts a female 28mm 1 and 1 8 inch socket to a m10 thread'. '.strtoupper('t')he adapter includes a circular mounting platform and wing nut fastening.
Price: £41.95