You using a square knot on those snare strings to tie off to the strainer?

Does not look like you are from the pics. (Hard to tell though)

Granny knots will constantly slip.

Square knot should solve your issue.

I agree. The bo badge drum especially; try tying left over right then right over left to get a square knot. or reverse it to r over l then l over r.

Are the adjustment screws backing out? I know some strainers use a rubber bumper stop to help hold the adjustment screw. On the strainer with the exposed bottom threads you can add a small thumbscrew to help hold the screw from backing out. But would be awkward to adjust tension in some cases maybe. Another trick is to take a screwdriver and make a slight vertical slash up the threads. This will of course marr the threads but also adds a little stiffness when you turn it. You can always try a new tension screw too. Hopefully you get some other ideas it's a good question. As these drums get older parts just start to wear out a little and need some TLC.

Thanks guys. I re-tied the string on both ends so all square knots on the Acro, but I just think the strainer adjustment screw is sloppy and backing out. It's weird because it just did it at the last gig after behaving all summer. Everything on the drum is nice and tight, I went over it screw by screw... must be showing it's age.

I'll have to check the standard at the next practice, I don't have it here.

Cassidy

To add to what FFR was saying, maybe try some Teflon tape on the threads as well, one wrap at a time until it is tight. Something to tighten up the fit, I would think, would be the ticket.

(never did this on a drum, but sounds logical to me anyways......)