I have a Bosch CSB 500-2 2 speed hammer drill for wood, concrete, and steel. As can be seen in the image below, the speed selection knob is missing.

Side view of drill highlighting missing speed selector

Would it be simply buying a new selector, which I imagine is pretty simple and inexpensive, and just opening the machine and slotting it in, or is this repair more complex than I envision? If more complex, I would appreciate a short summary of what needs to be done, but I am not looking for instructions on how to do it.


I imagine is pretty simple and inexpensive

Spare parts for older machines are often either unavailable or surprisingly expensive (e.g. armature £37).

is this repair more complex than I envision?

You'd need to open up the case and see if there is any other internal damage.

You might need to fabricate or improvise a speed selector. For example you might use polymorph or adapt a metal part.

A new Bosch drill of that sort can be purchased for £35-£50 (PSB500RE PSB680RE are often available on special offer at 30% lower price). A cheap store-brand drill might be £20 or less.

Links and prices are illustrative examples, a web-search will find local equiavalents.

  • Thanks, @RedGrittyBrick. What you mean by use polymorph? A new drill would be nice, but my beauty of a press drill does 99% of what I want. I'm actually asking because I'm trying to sell this drill, and trying to guestimate by how much it is devalued. And maybe offer the buyer some advice.
    – ProfK
    Feb 23 '17 at 15:00
  • Oh yes, the contemporary drills look almost exactly like my older one, so I guess there's a very good chance they even still use the same selector. Well, when I say contempory I actually mean one I owned about 6 years ago, where this one is well, well over ten years old, but you could hardly tell them apart.
    – ProfK
    Feb 23 '17 at 15:04
  • 1
    @ProfK. Polymorph is a low temperature thermoplastic that you can heat to >60C using a cup of hot water and hand-mould it to a desired shape. When cool it is as hard as nylon. I'm assuming that the switch mechanism of your drill doesn't get that hot (which is certainly questionable). I suspect the drill is worth less than $15, possibly much less. Feb 23 '17 at 15:12
  • With the selector, I could probably sell the drill for about ZAR300, or +- £18. Some things are more expensive in South Africa. A new, smaller, single-speed sells for between ZAR500 and ZAR1000.
    – ProfK
    Feb 23 '17 at 15:26
  • The armature is the engine, the beating heart of the machine, so why is 37 quid surprising? That seems like a very good price. If you paid 9 for lawnmower blades, you wouldn't be surprised if the engine is 500. Feb 23 '17 at 17:46

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