very good point, but im annoyed that you can get slowhacked on particular svencoop servers for spelling the admin's name wrong, that is taking it a bit TOO far
well, give us some information on the problem, we cant do anything without an error. no error = no solution. also check the steam forums if it is on steam, and if your on won, get steam now! won is now obsolete.
make sure you arent using more than 8 wads, it gves errors. try merging a few. also, go download gcfscape (http://countermap.counter-strike.net/Nemesis/index.php?p=25) and extract the wads from the cstrike folder. bets regards.
i got idea, make a platform which is part of the tank. make sure it cant rotate up and down. then make another gun that looks like it is "attatched" to the gun, but let it go up and down, but make sure the origin is in the same place. that should make the effect you want. not sure whether it works.