Need help with an older M&M Exposure Unit.

Hello, I was hoping someone could possible assist me in fixing a Nuarc M&M First Light 2532.

I just purchased this second hand with out a vacuum pump for $125. All of the lights work and the digital timer, except it did not come with a vacuum pump.
I can't seem to find a replacement pump online so I have reached out to M&M to see if they can assist, but I had a few questions in particular.

Could I possible buy a second hand pump like the one below? I saw a DIY exposure unit set up on here, and was thinking I could possible follow the same method with his pump and tubes, and replacing the blanket. I don't have much knowledge with setting up a pump, but I believe if I can get pointed to the correct tube sizes and adapters I need, I can piece it together.

Pump: https://www.harborfreight.com/25-cfm-vacuum-pump-98076.html

I was also curious, could I possible get by without a vacuum pump? If I seal the hole on the blanket, and provided weight on top of my screen to keep the design from moving, could I possible get by with this?

Thank you again.