Stop using that bit of pipe with a bolt in the end! Suitable for low pressure and vacuum applications. Can be secured to the pipe/stub/thread using a cable tie, small hose clip or simply pushed on (application dependant).
Motorcycle Carb Vacuum Gauge Synchronizer Balancer 4 Cylinder Gauge Tool Set
DHA Motorcycle Fuel Vacuum Carburetor Synchronizer Carb Sync Balancer Gauge Too
4 Cylinder Motorcycle Fuel Vacuum Carburetor Synchronizer Carb Sync Gauge Tool
4 Cylinder Motorcycle Fuel Vacuum Carburetor Synchronizer Carb Sync Gauge ToolUK
Motorcycle Fuel Vacuum Carburetor Synchronizer Carb Sync Gauge Tool Kit
Motorcycle Carb Carburetor Vacuum 4 Synchronizer Gauges Tool Balancer Gauge Kits