How to make a solar filter for my frac

[Cjg]

In readiness for the Transit of Mercury, what would be the best / safest way to make a solar filter for my frac? Assuming that the bader solar film is attached to something in some way before placing over the front of the frac...am guesssing there's a clever way to do this rather than just wrap the sheet over the front and stick it in place with tape?

My DIY skills are rudimentary, so nothing too complex and involved please.

Thanks,

Chris

[Owmuchonomy]

What size is your scope? If it is 4" this is how I did it.

 

[Cjg]

Thank you Owen, it's a 3 incher so your guide will be perfect.

Cheers,

Chris