Repro Cromemco joysticks...

Hi All, I want to build a couple of reproduction (work alike) Cromemco joystick consoles for two reasons: 1) I don't have any real ones. 2) I'll be able to let the "unwashed masses" (my children included) play various games with worrying about them getting destroyed. To this end, I've looked at the pdf of the manual and (to my delight) discovered that I have all of the required parts. Well, almost. Two things: 1) The manual calls for a 45 Ohm QUAM speaker. All I have are plain old run-of-the-mill 8 Ohm internal PC speakers. My ignorance of basic electronics shines through... 30 minutes of googling and I'm not sure what QUAM means. Anyway, can I substitute the speaker? With some modification to the schematic? 2) The manual does not specify the pot values on the joystick. The joysticks I have have 100K Ohm pots (thanks Tim Shoppa!). Is that value correct? Is the value important? Can I adjust for it on the D+7A or in the circuit on the joystick side? Also, an esthetic question: are the joysticks on the original self-centering? Thanks for any help! BTW: Both manuals (joystick console and D+7A card) are in the Harte repository. No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.487 / Virus Database: 269.13.22/1013 - Release Date: 9/17/2007 1:29 PM