I find these pushers are a bit dangerous if they are tilted, not straight, or as most antique ones are, they have damaged tips and can cause grief..
If you purchase a well equipped staking set, which you definitely WILL need, you can use this to safely push out jewels, amongst a 1001 other uses. Some even have jeweling attachments.
For the past two years I’ve been using pegwood or a couple of brass pushers I made that fit onto a staking punch.. the settings usually aren’t in that tight anyway, but keeping your pusher perfectly straight is important.