Tha main advantage of a prop version over a cr2.. is no joint parametres to futz over 8 ) plus you can set the min max so teh door opens properly... i.e. min -90.000 max 0.000 the door will only swing to the left.. and whilst hacking the file.. set forceLimits to 1 that way reguardless of teh document settings limits will be imposed.. this prevents the door window etc from sliding through the wall... when you save the prop... select save subset.. then select all teh bits involved.. that way when you load it everything's there... Cheers