Replacing the SME 10 stock tonearm

I would appreciate any input on this.

My friend has a SME 10 turntable with the stock 309 tonearm. This has a removable headshell, but removing the headshell is not as simple as removing with a standard mount headshell. Due to age he has decreased dexterity and diminished eyesight, so removing the headshell has resulted in some damaged cartridges.

I would appreciate input regarding compatibility and experience replacing the stock arm with a standard mount removable headshell tonearm. I would especially appreciate input on what might be a drop in replacement with a removable standard mount headshell.

I don’t have current easy access to the turntable as my friend lives in a different part of the country. I plan to fly in for a visit and make the change for my friend during my visit. So to the extent I can have what I need and be prepared when I arrive will optimize my opportunity to accomplish this over a weekend. 

Thanks for your help with this

 Jim Perry