My pull string/starter handle popped when trying to start it. Looking at the disassembly to install a replacement rope it appears that it is riveted in place. Do I need to drill out these rivets or is there another way? Thanks I could not find an owners manual online.

I have a Sears 3000 psi washer with a 9 hp Briggs engine. The pump model number is XMV 3G30. The problem is that it went crazy and was stalling the engine until the pressure hose burst.The hose was in excellent condition until this happened. I am ignorant of how these things work,however, but I read somewhere about an unloader valve that may be the problem. What do these things look like, where can I find it, and how can I check it? I am mechanically proficient and have more that adequate tools to disassemble this thing. I just don't want to mess something up that will cost me lots of money. Any help will be appreciated. Thanks in advance. Mike P.S. This is my first post.