Hello,
My Honda CRX 1.5L needs to have the timing belt fixed. I bought the car knowing this was the problem, but I did not realize that the Crankshaft pulley had no timing marks on it.
My question is, Can I simply put the #1 piston at TDC and assume that with the cam aligned with marks that the crank is set properly? It was not until I got working on it that I found that there were no marks what so ever. The Chilton Manuel that I have simply says to look for a painted white dot on the Crankshaft pulley, but mine must have worn off or something because I have looked and looked and it simply is not there. I can however get the TDC by your straw method just fine, but I wanted to be sure this is OK.
Thank You,

Set the crankshaft so that the No. 1 piston is at top dead center (TDC). Align the groove on the teeth side of the timing belt drive pulley to the arrow pointer on the oil pump.

This link should help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-honda-civics-46563-2.html#post232786