There are plenty of ABS cases which come with a rubber dust/moisture proof seal too and they are very affordable, also alloy jiffy boxes with the same and well worth looking into for any home projects.. I tend to purchase these for most outdoor related projects.
An old method for making wires pull proof from many boxes including speaker boxes and other electronic devices was tie a knot in the wire inside before feeding the wire out (or before connecting the terminals) or cable tying the cable to a chassis or circuit board hole. I was taught that in electronic trades mid to late 70s by an ld teacher at Ultimo TAFE. Then for mains cords there were the two half (joined by a flexible tab0 locks which i\were compressed using hydraulic/pneumatic or hand speciality pliers. They then expanded once inserted into the hole which was there to retain the cable. I used to put 400 on TV sets a day at both Rank NEC in Penrith and later an National Panasonic (Matsush!ta electric company (censor always picks up rude sh*t word in the middle but it was the company name back then) also in Penrith (NSW) I worked in TV set production/repairs/everything at both plants for 6 years after leaving school while studying 4 nights per week for my technicians qualifications. I still remove them from any old set I find and keep them here in case I have a need to lock a cable in place (power cables).
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I'm not even sure whether they are still used but they never failed and were always a problem to remove without the right tool.
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Acetone mixed with styrene can make a glue mix that adheres with many plastics. But not PVC or PLA.
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It can also make the most amazing mountain ranges pn model train layouts, drizzle the acetone to dissolve small amounts of the polystyrene. I did this on my sons little z or N gauge set back in 2001 when my son was only 5 or 6, it looked great with a little paint and araldite with colouring mixed for a water run off down the mountain side. The rest of the tunnel was toilet paper over chicken wire and paint to adhere it.