Are you planning on shooting with it? I have a similar 120 6x9 folder (franka rolfix ii) that I like a lot because it's a medium format you can actually fit in your pocket!

If I can get the pinholes fixed in the bellows, yes I am. I have a couple of 6x6 folders I use fairly often, but wanted a 6x9. Besides, this one was looking lonely and unloved!

I have heard black silicon rubber and a pin can be used - push the pin through the hole, put a blob of silicon on it, pull it through.

I have not tried this, but hey, you already have a broken camera ... little risk in giving it a try!