cartridge setup help


Was wondering if anyone near Las Vegas with cartridge setup experience? I purchased a used AT150MLX for my friend, but we can't seem to get a firm screw connection in the open channel. Would be willing to pay for help.
-George
auntjenof2
Is that a problem to buy a set of none magnetic screws and nuts on ebay just to screw it up firmly on the headshell ? Yamamoto sells sets of screws for any cartridges. Or with a set of these special screw you don’t even need a tool to use it and they are also available on ebay. With the right size it shouldn’t be a problem.

But first you have to remove the stylus on those AT cartridges, then screw it up firmly, after that you can add the stylus assembly back to the cart.

autjenof2, If I understand your description well one side of the

body misses the screw hole or provision to fasten this side

of the cart? With an ''hand bit'' you can drill in plastic body.

If I understand your second sentence well your friend damaged

''our'' Virtuoso (aka ''my former'' and ''your later'') ?

As a kind of compensation you can get an second Clearadio from

me for a ''friend price''. The name is ''Aurum classics'' with perfect

stylus.

vegasears, thank you so much. I passed on your info to my friend. 
Nandric, I think i mean it is a non threaded cartridge body. If you look at a pic online it looks like an open channel for the screws. BTW, he was using a Clearaudio Virtuoso that I had purchased from you years ago. We were playing an old Elvis 45, and the needle went flying and snapped off the whole cantilever. 

The problem description is not clear. What do you mean with

''the screw connection in the open channel'' ? ''Open channel''

make no sense by whatever cart. There is left and right channel

by any stereo cart but not ''open channel''.

I live in Henderson,  I use a AT150MLX and I have a bit of experience.  Email me at allan.walter@yahoo.com and I'll shoot you my phone number.  Also I don't want your money, It's the season of giving!
It's worth the drive to Pasadena, to have Brian Berdan at Audio Elements correctly install and perfectly align the cartridge.
a bag of cartridge screws/bolts can be easily secured from E-bay or Amazon.  Get the right size or the setup is wrong.
Actually what would be ideal is to use a nut that will fit such that it cannot move in the little square cut out under the screw hole, that way you can tighten down into it nice and easy. So if none of the nuts you have are suitable maybe go out a look for a slightly bigger one
My experience with this type of channel is that the screw is quite loose and it is the bolt tightening on the edge that secures it so I'd not worry too much if the screw alone is a very loose fit as long as you can tighten the bolt down firmly. Obviously if this doesn't work you need bigger screws, but that would be surprising as the screw size (i.e. diameter) is usually given for all cartridges, it's just the length that varies
It came with a bagful of screws and nuts from AT, but nothing seems to fit firmly in the channel. 
Not sure if this is stating the obvious but this is not a threaded cartridge and it will need a nut and bolt to fix it. It should have come with a set of suitable screws or you can pick them up online like this
https://www.ebay.com/itm/Deluxe-Turntable-Cartridge-Headshell-Mounting-Bolt-Screw-Kit-39-Pieces-/252...