>>18500129
Nice. Since your watch is a Promaster, there may be a thin metal tube inside the OEM rubber strap where the spring bar is, mine does. Plus the spring bar maybe 2mm thicc. You may try to use the use the 'string method' on how to remove spring bars, just do a quick YT research. If it fails, get something like this and use the angled part to remove it. Just be careful not to bruise or dent the steel case.