A 1/4" sheet metal screw in a spare piece of return line worked pretty well for me for a couple of weeks until I could get the proper part. Looking back if I would have wrapped some teflon tape around the screw it would have been even better.

__________________
Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo