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There are some pre-processes that need to go through before assembling commenced. Once completed, the assembling processes should go without any tolerance and clearance issues.
Here are the processes:
1. Cleaning and clearing tolerance processes.
2. Making sure/checking the parts just fit in. Use the following tools:
Tools Used for Cleaning and Clearing Tolerance
The figures above are tools that you may need to run pre-assembly processes but not limited to.
Cleaning and Clearing Tolerance
The figures above explains themselves how to use the tools except the heated rod. The heated rod is used whenever can not use drill for not reachable position such as cleaning or clearing holes for pushrod. Just push the heated rod quickly until it gets out of the hole so that it clears unwanted plastics inside the hole.