I need a lower leg clamp for my 190xb manfrotto tripod.

Hi Stefan
Possibly some bad news for you..., the Part #R190,304 you ordered is not made for the #190XB tripod..., it is for a model several years older (though it MAY fit)..., (see link for correct parts diagram)!!!!
http://www.manfrottospares.com/download/pdfs/190XB_20061025.pdf
To easiest way to replace one of the top leg castings is to first remove the centre column and then support the tripod in such a way that the (3) legs are not touching the ground (i.e.: all the weight is supported by the casting through which the centre column would normally mount. You will then need to undo the (3) screw (allen key style) that pierce this casting...., (the reason for wanting to support the tripod via the bottom of this casting is that all the small parts SHOULD stay in place when the top casting is separated from the lower casting. Once this has been done..., carefully remove the leg with the damaged top casting...., replace it (making sure the new one is facing the right direction) & then reverse the procedure.

Hope this helps

Peter

The 3rd video on the right side of this page web site will show you how. http://bogentripodparts.com/repairs.htm

You can look on line at manuals.com or from the manufacture's website

loosen the allen head screw for that legs snap lock

Little confused here. Is the head the part you want to detach from an older set of legs? Do you want to remove center post from new legs or old legs. The base plate remains on the center post/ Aftre removing 3 set screws, and you want to remove the head from the baseplate and it will not turn, grap slip joint pliers or a pipe wrench, wrap the jaws with cloth ( to prevent marring of head or legs) and while holding head with wrench, have someone else turn legs

Use an 8mm, I believe, socket and tighten 1/4 turn the nuts on the lower half of the leg lock. For instance, the top leg lock is connected to the top and middle leg. Tighten the lower 2 nuts (located on the middle leg half of the lock) 1/5 turn. If that does not do it, tighten 1/4 turn again. Be sure not to over-tighten.

For parts, try www.bogentripodparts.com

 

Yes you can. But I saw that your Manfrotto is possible to buy for 50 Euro.
Anyway the part you need is the full leg called CODE:
R785,203B
you can see the datasheet on the spare part site of Manfrotto:
http://www.manfrotto.com/webdav/site/manfrotto/shared/manfrotto_nord/pdf/7/785B_20070503.pdf
Regards
PDG

Try www.BogenTripodParts.com for that part. There is listed the widest selection of Bogen parts and support more models than any other web site I’ve seen. There are losts of pictures to help find just the right part

IT SOME TIMES TAKES A LOT OF EFFORT TO SEPARTE THE HEAD FROM THE TRIPOD. MAKE SURE YOU REMOVE THE 3 LITTLE SCREWS FROM BELOW THE HEAD, AND MAKE SURE THE TRIPOD AND HEAD ARE NOT COLD. IF THEYA RE WARM THEY WILL SEPARATE EASIER.