Are you allowed to make, buy and sell trumpets?

The torah forbids creating artifacts used in the beis hamikdash (based on the verse lo taasun iti (Exodus 20:19), see Talmud Avoda Zara 43a, Rambam Beit Habechira 7:10 and Shulchan Aruch YD 141:8). This would seem to include the trumpets, which the gemara elsewhere learns could be made of any material. Therefore, can one create, buy, sell or own these instruments?