These items were all fashioned from scrap metal/timber during stints of delicious unemployment .
Some require a lathe, some a welder, some both, some none.

They will, with some luck:

• Remove a crankshaft main bearing

• Support an engine or bike on a trolley jack

• Set valve timing (degree wheel)

• Remove/replace a wrist pin

• Compress rings

• Compress valve springs

• Remove splined boss on gearbox input shaft

• Tighten Allen bolt on twin plug head

• Align clutch plates

• Assist in float level adjustment - a simple template

• Ease the pain of replacing a  clutch cable

• Sync carbs. Not mine, but worth inspecting at this remote link.