What would I call it, and where to find it

[Ozarkwoodswalker]

I purchased an old winchester model 61 22lr from a kind old friend. I stayed at his this weekend while going to another dear old past coworkers funeral. The friend I stayed with is starting to have some health issues. During the course of the weekend i bought this old 22 he has had since he was 17. ( mainly wanted an item to remember him by. It is in fair condition, good bore, and functions perfectly. On one side of the wooden pump slide handle the screw is missing. What would be the proper name to look for that item under , and where would I likely be able to find such a screw? Thanks

[BigAl52]

https://www.ebay.com/itm/400520626416

Do they look like this Ozark?
If not do a model 61 search online and there is quite a bit of info out there and some parts are avaliable.

[Ozarkwoodswalker]

Yes! Thanks!